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Standard glossary of terms used in Software Testing
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Standard glossary of terms used in Software Testing
Version 2.0 (dd. December, 2nd 2007)
Produced by the ‘Glossary Working Party’
International Software Testing Qualifications Board
Editor : Erik van Veenendaal (The Netherlands) Copyright Notice
This document may be copied in its entirety, or extracts made, if the source is acknowledged.
Table of Content
Foreword
1. Introduction
2. Scope
3. Arrangement
4. Normative references
5. Trademarks
6. Definitions
A |
B |
C |
D |
E |
F |
G |
H |
I |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W
Annex A (Informative)
Annex B (Method of commenting on this glossary)
Contributors
Change History
In compiling this glossary the working party has sought the views and comments of as broad a spectrum of opinion as possible in industry, commerce and government bodies and organizations, with the aim of producing an international testing standard which would gain acceptance in as wide a field as possible. Total agreement will rarely, if ever, be achieved in compiling a document of this nature. Contributions to this glossary have been received from the testing communities in Australia, Belgium, Finland, Germany, India, Israel, The Netherlands, Norway, Portugal, Sweden, Switzerland, United Kingdom, and USA.
Many (software) testers have used BS 7925-1 since its original publication in 1998. It has served also as a major reference for the Information Systems Examination Board (ISEB) qualification at both Foundation and Practitioner level. The standard was initially developed with a bias towards component testing, but, since its publication, many comments and proposals for new definitions have been submitted to both improve and expand the standard to cover a wider range of software testing. In this new version of the testing glossary many of these suggested updates have been incorporated. It will be used as a reference document for the International Software Testing Qualification Board (ISTQB) software testing qualification scheme.
Much time and effort is wasted both within and between industry, commerce, government and professional and academic institutions when ambiguities arise as a result of the inability to differentiate adequately between such terms as ‘statement coverage’ and ‘decision coverage’; ‘test suite’, ‘test specification’ and ‘test plan’ and similar terms which form an interface between various sectors of society. Moreover, the professional or technical use of these terms is often at variance with different meanings attributed to them.
This document presents concepts, terms and definitions designed to aid communication in (software) testing and related disciplines.
The glossary has been arranged in a single section of definitions ordered alphabetically. Some terms are preferred to other synonymous ones, in which case, the definition of the preferred term appears, with the synonymous ones referring to that. For example structural testing refers to white box testing. For synonyms, the "See" indicator is used
"See also" cross-references are also used. They assist the user to quickly navigate to the right index term. "See also" cross-references are constructed for relationships such as broader term to a narrower term, and overlapping meaning between two terms.
At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based upon this Standard are encouraged to investigate the possibility of applying the most recent edition of the standards listed below. Members of IEC and ISO maintain registers of currently valid International Standards.
In this document the following trademarks are used:
abstract test case: See high level test case.
acceptance: See acceptance testing.
acceptance criteria: The exit criteria that a component or system must satisfy in order to be accepted by a user, customer, or other authorized entity. [IEEE 610]
acceptance testing: Formal testing with respect to user needs, requirements, and business processes conducted to determine whether or not a system satisfies the acceptance criteria and to enable the user, customers or other authorized entity to determine whether or not to accept the system. [After IEEE 610]
accessibility testing: Testing to determine the ease by which users with disabilities can use a component or system. [Gerrard]
accuracy: The capability of the software product to provide the right or agreed results or effects with the needed degree of precision. [ISO 9126] See also functionality testing.
action word driven testing: See keyword driven testing
actual outcome: See actual result.
actual result: The behavior produced/observed when a component or system is tested.
ad hoc review: See informal review.
ad hoc testing: Testing carried out informally; no formal test preparation takes place, no recognized test design technique is used, there are no expectations for results and arbitrariness guides the test execution activity.
adaptability: The capability of the software product to be adapted for different specified environments without applying actions or means other than those provided for this purpose for the software considered. [ISO 9126] See also portability.
agile testing: Testing practice for a project using agile methodologies, such as extreme programming (XP), treating development as the customer of testing and emphasizing the test-first design paradigm. See also test driven development.
algorithm test [TMap]: See branch testing.
alpha testing: Simulated or actual operational testing by potential users/customers or an independent test team at the developers’ site, but outside the development organization. Alpha testing is often employed for off-the-shelf software as a form of internal acceptance testing.
analyzability: The capability of the software product to be diagnosed for deficiencies or causes of failures in the software, or for the parts to be modified to be identified. [ISO 9126] See also maintainability.
analyzer: See static analyzer.
anomaly: Any condition that deviates from expectation based on requirements specifications, design documents, user documents, standards, etc. or from someone’s perception or experience. Anomalies may be found during, but not limited to, reviewing, testing, analysis, compilation, or use of software products or applicable documentation. [IEEE 1044] See also bug, defect, deviation, error, fault, failure, incident, problem.
arc testing: See branch testing.
attack: Directed and focused attempt to evaluate the quality, especially reliability, of a test object by attempting to force specific failures to occur.
attractiveness: The capability of the software product to be attractive to the user. [ISO 9126] See also usability.
audit: An independent evaluation of software products or processes to ascertain compliance to standards, guidelines, specifications, and/or procedures based on objective criteria, including documents that specify:
(1) the form or content of the products to be produced
(2) the process by which the products shall be produced
(3) how compliance to standards or guidelines shall be measured. [IEEE 1028]
audit trail: A path by which the original input to a process (e.g. data) can be traced back through the process, taking the process output as a starting point. This facilitates defect analysis and allows a process audit to be carried out. [After TMap]
automated testware: Testware used in automated testing, such as tool scripts.
availability: The degree to which a component or system is operational and accessible when required for use. Often expressed as a percentage. [IEEE 610]
back-to-back testing: Testing in which two or more variants of a component or system are executed with the same inputs, the outputs compared, and analyzed in cases of discrepancies. [IEEE 610]
baseline: A specification or software product that has been formally reviewed or agreed upon, that thereafter serves as the basis for further development, and that can be changed only through a formal change control process. [After IEEE 610]
basic block: A sequence of one or more consecutive executable statements containing no branches. Note: A node in a control flow graph represents a basic block.
basis test set: A set of test cases derived from the internal structure of a component or specification to ensure that 100% of a specified coverage criterion will be achieved.
bebugging: See fault seeding. [Abbott]
behavior: The response of a component or system to a set of input values and preconditions.
benchmark test: (1) A standard against which measurements or comparisons can be made. (2) A test that is be used to compare components or systems to each other or to a standard as in (1). [After IEEE 610]
bespoke software: Software developed specifically for a set of users or customers. The opposite is off-the-shelf software.
best practice: A superior method or innovative practice that contributes to the improved performance of an organization under given context, usually recognized as ‘best’ by other peer organizations.
beta testing: Operational testing by potential and/or existing users/customers at an external site not otherwise involved with the developers, to determine whether or not a component or system satisfies the user/customer needs and fits within the business processes. Beta testing is often employed as a form of external acceptance testing for off-the-shelf software in order to acquire feedback from the market.
big-bang testing: A type of integration testing in which software elements, hardware elements, or both are combined all at once into a component or an overall system, rather than in stages. [After IEEE 610] See also integration testing.
black-box technique: See black box test design technique.
black-box testing: Testing, either functional or non-functional, without reference to the internal structure of the component or system.
black-box test design technique: Procedure to derive and/or select test cases based on an analysis of the specification, either functional or non-functional, of a component or system without reference to its internal structure.
blocked test case: A test case that cannot be executed because the preconditions for its execution are not fulfilled.
bottom-up testing: An incremental approach to integration testing where the lowest level components are tested first, and then used to facilitate the testing of higher level components. This process is repeated until the component at the top of the hierarchy is tested. See also integration testing.
boundary value: An input value or output value which is on the edge of an equivalence partition or at the smallest incremental distance on either side of an edge, for example the minimum or maximum value of a range.
boundary value analysis: A black box test design technique in which test cases are designed based on boundary values. See also boundary value.
boundary value coverage: The percentage of boundary values that have been exercised by a test suite.
boundary value testing: See boundary value analysis.
branch: A basic block that can be selected for execution based on a program construct in which one of two or more alternative program paths is available, e.g. case, jump, go to, if-then-else.
branch condition: See condition.
branch condition combination coverage: See multiple condition coverage.
branch condition combination testing: See multiple condition testing.
branch condition coverage: See condition coverage.
branch coverage: The percentage of branches that have been exercised by a test suite. 100% branch coverage implies both 100% decision coverage and 100% statement coverage.
branch testing: A white box test design technique in which test cases are designed to execute branches.
buffer: A device or storage area used to store data temporarily for differences in rates of data flow, time or occurrence of events, or amounts of data that can be handled by the devices or processes involved in the transfer or use of the data. [IEEE 610]
buffer overflow: A memory access defect due to the attempt by a process to store data beyond the boundaries of a fixed length buffer, resulting in overwriting of adjacent memory areas or the raising of an overflow exception. See also buffer.
bug: See defect.
bug report: See defect report.
bug taxonomy: See defect taxonomy.
bug tracking tool: See defect management tool.
business process-based testing: An approach to testing in which test cases are designed based on descriptions and/or knowledge of business processes.
Capability Maturity Model (CMM): A five level staged framework that describes the key elements of an effective software process. The Capability Maturity Model covers best-practices for planning, engineering and managing software development and maintenance. [CMM] See also Capability Maturity Model Integration (CMMI).
Capability Maturity Model Integration (CMMI): A framework that describes the key elements of an effective product development and maintenance process. The Capability Maturity Model Integration covers best-practices for planning, engineering and managing product development and maintenance. CMMI is the designated successor of the CMM. [CMMI] See also Capability Maturity Model (CMM).
capture/playback tool: A type of test execution tool where inputs are recorded during manual testing in order to generate automated test scripts that can be executed later (i.e. replayed). These tools are often used to support automated regression testing.
capture/replay tool: See capture/playback tool.
CASE: Acronym for Computer Aided Software Engineering.
CAST: Acronym for Computer Aided Software Testing. See also test automation.
cause-effect graph: A graphical representation of inputs and/or stimuli (causes) with their associated outputs (effects), which can be used to design test cases.
cause-effect graphing: A black box test design technique in which test cases are designed from cause-effect graphs. [BS 7925/2]
cause-effect analysis: See cause-effect graphing.
cause-effect decision table: See decision table.
certification: The process of confirming that a component, system or person complies with its specified requirements, e.g. by passing an exam.
changeability: The capability of the software product to enable specified modifications to be implemented. [ISO 9126] See also maintainability.
change control: See configuration control.
change control board: See configuration control board.
checker: See reviewer.
Chow's coverage metrics: See N-switch coverage. [Chow]
classification tree: A tree showing equivalence partitions hierarchically ordered, which is used to design test cases in the classification tree method. See also classification tree method.
classification tree method: A black box test design technique in which test cases, described by means of a classification tree, are designed to execute combinations of representatives of input and/or output domains. [Grochtmann]
code: Computer instructions and data definitions expressed in a programming language or in a form output by an assembler, compiler or other translator. [IEEE 610]
code analyzer: See static code analyzer.
code coverage: An analysis method that determines which parts of the software have been executed (covered) by the test suite and which parts have not been executed, e.g. statement coverage, decision coverage or condition coverage.
code-based testing: See white box testing.
co-existence: The capability of the software product to co-exist with other independent software in a common environment sharing common resources. [ISO 9126] See also portability.
commercial off-the-shelf software: See off-the-shelf software.
comparator: See test comparator.
compatibility testing: See interoperability testing.
compiler: A software tool that translates programs expressed in a high order language into their machine language equivalents. [IEEE 610]
complete testing: See exhaustive testing.
completion criteria: See exit criteria.
complexity: The degree to which a component or system has a design and/or internal structure that is difficult to understand, maintain and verify. See also cyclomatic complexity.
compliance: The capability of the software product to adhere to standards, conventions or regulations in laws and similar prescriptions. [ISO 9126]
compliance testing: The process of testing to determine the compliance of the component or system.
component: A minimal software item that can be tested in isolation.
component integration testing: Testing performed to expose defects in the interfaces and interaction between integrated components.
component specification: A description of a component’s function in terms of its output values for specified input values under specified conditions, and required non-functional behavior (e.g. resource-utilization).
component testing: The testing of individual software components. [After IEEE 610]
compound condition: Two or more single conditions joined by means of a logical operator (AND, OR or XOR), e.g. ‘A>B AND C>1000’.
concrete test case: See low level test case.
concurrency testing: Testing to determine how the occurrence of two or more activities within the same interval of time, achieved either by interleaving the activities or by simultaneous execution, is handled by the component or system. [After IEEE 610]
condition: A logical expression that can be evaluated as True or False, e.g. A>B. See also test condition.
condition combination coverage: See multiple condition coverage.
condition combination testing: See multiple condition testing.
condition coverage: The percentage of condition outcomes that have been exercised by a test suite. 100% condition coverage requires each single condition in every decision statement to be tested as True and False.
condition determination coverage: The percentage of all single condition outcomes that independently affect a decision outcome that have been exercised by a test case suite. 100% condition determination coverage implies 100% decision condition coverage.
condition determination testing: A white box test design technique in which test cases are designed to execute single condition outcomes that independently affect a decision outcome.
condition testing: A white box test design technique in which test cases are designed to execute condition outcomes.
condition outcome: The evaluation of a condition to True or False.
confidence test: See smoke test.
configuration: The composition of a component or system as defined by the number, nature, and interconnections of its constituent parts.
configuration auditing: The function to check on the contents of libraries of configuration items, e.g. for standards compliance. [IEEE 610]
configuration control: An element of configuration management, consisting of the evaluation, co-ordination, approval or disapproval, and implementation of changes to configuration items after formal establishment of their configuration identification. [IEEE 610]
configuration control board (CCB): A group of people responsible for evaluating and approving or disapproving proposed changes to configuration items, and for ensuring implementation of approved changes. [IEEE 610]
configuration identification: An element of configuration management, consisting of selecting the configuration items for a system and recording their functional and physical characteristics in technical documentation. [IEEE 610]
configuration item: An aggregation of hardware, software or both, that is designated for configuration management and treated as a single entity in the configuration management process. [IEEE 610]
configuration management: A discipline applying technical and administrative direction and surveillance to: identify and document the functional and physical characteristics of a configuration item, control changes to those characteristics, record and report change processing and implementation status, and verify compliance with specified requirements. [IEEE 610]
configuration management tool: A tool that provides support for the identification and control of configuration items, their status over changes and versions, and the release of baselines consisting of configuration items.
configuration testing: See portability testing.
confirmation testing: See re-testing.
conformance testing: See compliance testing.
consistency: The degree of uniformity, standardization, and freedom from contradiction among the documents or parts of a component or system. [IEEE 610]
control flow: A sequence of events (paths) in the execution through a component or system.
control flow analysis: A form of static analysis based on a representation of sequences of events (paths) in the execution through a component or system.
control flow graph: An abstract representation of all possible sequences of events (paths) in the execution through a component or system.
control flow path: See path.
continuous representation: A capability maturity model structure wherein capability levels provide a recommended order for approaching process improvement within specified process areas. [CMMI]
conversion testing: Testing of software used to convert data from existing systems for use in replacement systems.
cost of quality: The total costs incurred on quality activities and issues and often split into prevention costs, appraisal costs, internal failure costs and external failure costs.
COTS: Acronym for Commercial Off-The-Shelf software. See off-the-shelf software.
coverage: The degree, expressed as a percentage, to which a specified coverage item has been exercised by a test suite.
coverage analysis: Measurement of achieved coverage to a specified coverage item during test execution referring to predetermined criteria to determine whether additional testing is required and if so, which test cases are needed.
coverage measurement tool: See coverage tool.
coverage item: An entity or property used as a basis for test coverage, e.g. equivalence partitions or code statements.
coverage tool: A tool that provides objective measures of what structural elements, e.g. statements, branches have been exercised by a test suite.
custom software: See bespoke software.
cyclomatic complexity: The number of independent paths through a program. Cyclomatic complexity is defined as: L – N + 2P, where
- L = the number of edges/links in a graph
- N = the number of nodes in a graph
- P = the number of disconnected parts of the graph (e.g. a called graph and a subroutine)
[After McCabe]
cyclomatic number: See cyclomatic complexity.
daily build: a development activity where a complete system is compiled and linked every day (usually overnight), so that a consistent system is available at any time including all latest changes.
data definition: An executable statement where a variable is assigned a value.
data driven testing: A scripting technique that stores test input and expected results in a table or spreadsheet, so that a single control script can execute all of the tests in the table. Data driven testing is often used to support the application of test execution tools such as capture/playback tools. [Fewster and Graham] See also keyword driven testing.
data flow: An abstract representation of the sequence and possible changes of the state of data objects, where the state of an object is any of: creation, usage, or destruction. [Beizer]
data flow analysis: A form of static analysis based on the definition and usage of variables.
data flow coverage: The percentage of definition-use pairs that have been exercised by a test suite.
data flow testing: A white box test design technique in which test cases are designed to execute definition and use pairs of variables.
data integrity testing: See database integrity testing.
database integrity testing: Testing the methods and processes used to access and manage the data(base), to ensure access methods, processes and data rules function as expected and that during access to the database, data is not corrupted or unexpectedly deleted, updated or created.
dead code: See unreachable code.
debugger: See debugging tool.
debugging: The process of finding, analyzing and removing the causes of failures in software.
debugging tool: A tool used by programmers to reproduce failures, investigate the state of programs and find the corresponding defect. Debuggers enable programmers to execute programs step by step, to halt a program at any program statement and to set and examine program variables.
decision: A program point at which the control flow has two or more alternative routes. A node with two or more links to separate branches.
decision condition coverage: The percentage of all condition outcomes and decision outcomes that have been exercised by a test suite. 100% decision condition coverage implies both 100% condition coverage and 100% decision coverage.
decision condition testing: A white box test design technique in which test cases are designed to execute condition outcomes and decision outcomes.
decision coverage: The percentage of decision outcomes that have been exercised by a test suite. 100% decision coverage implies both 100% branch coverage and 100% statement coverage.
decision outcome: The result of a decision (which therefore determines the branches to be taken).
decision table: A table showing combinations of inputs and/or stimuli (causes) with their associated outputs and/or actions (effects), which can be used to design test cases.
decision table testing: A black box test design technique in which test cases are designed to execute the combinations of inputs and/or stimuli (causes) shown in a decision table. [Veenendaal] See also decision table.
decision testing: A white box test design technique in which test cases are designed to execute decision outcomes.
defect: A flaw in a component or system that can cause the component or system to fail to perform its required function, e.g. an incorrect statement or data definition. A defect, if encountered during execution, may cause a failure of the component or system.
defect based technique: See defect based test design technique.
defect based test design technique: A procedure to derive and/or select test cases targeted at one or more defect categories, with tests being developed from what is known about the specific defect category. See also defect taxonomy.
defect density: The number of defects identified in a component or system divided by the size of the component or system (expressed in standard measurement terms, e.g. lines-of-code, number of classes or function points).
Defect Detection Percentage (DDP): The number of defects found by a test phase, divided by the number found by that test phase and any other means afterwards.
defect management: The process of recognizing, investigating, taking action and disposing of defects. It involves recording defects, classifying them and identifying the impact. [After IEEE 1044]
defect management tool: A tool that facilitates the recording and status tracking of defects and changes. They often have workflow-oriented facilities to track and control the allocation, correction and re-testing of defects and provide reporting facilities. See also incident management tool.
defect masking: An occurrence in which one defect prevents the detection of another. [After IEEE 610]
defect report: A document reporting on any flaw in a component or system that can cause the component or system to fail to perform its required function. [After IEEE 829]
defect taxonomy: A system of (hierarchical) categories designed to be a useful aid for reproducibly classifying defects.
defect tracking tool: See defect management tool.
definition-use pair: The association of the definition of a variable with the use of that variable. Variable uses include computational (e.g. multiplication) or to direct the execution of a path ("predicate" use).
deliverable: Any (work) product that must be delivered to someone other than the (work) product’s author.
design-based testing: An approach to testing in which test cases are designed based on the architecture and/or detailed design of a component or system (e.g. tests of interfaces between components or systems).
desk checking: Testing of software or specification by manual simulation of its execution. See also static analysis.
development testing: Formal or informal testing conducted during the implementation of a component or system, usually in the development environment by developers. [After IEEE 610]
deviation: See incident.
deviation report: See incident report.
dirty testing: See negative testing.
documentation testing: Testing the quality of the documentation, e.g. user guide or installation guide.
domain: The set from which valid input and/or output values can be selected.
driver: A software component or test tool that replaces a component that takes care of the control and/or the calling of a component or system. [After TMap]
dynamic analysis: The process of evaluating behavior, e.g. memory performance, CPU usage, of a system or component during execution. [After IEEE 610]
dynamic analysis tool: A tool that provides run-time information on the state of the software code. These tools are most commonly used to identify unassigned pointers, check pointer arithmetic and to monitor the allocation, use and de-allocation of memory and to flag memory leaks.
dynamic comparison: Comparison of actual and expected results, performed while the software is being executed, for example by a test execution tool.
dynamic testing: Testing that involves the execution of the software of a component or system.
efficiency: The capability of the software product to provide appropriate performance, relative to the amount of resources used under stated conditions. [ISO 9126]
efficiency testing: The process of testing to determine the efficiency of a software product.
elementary comparison testing: A black box test design technique in which test cases are designed to execute combinations of inputs using the concept of condition determination coverage. [TMap]
emulator: A device, computer program, or system that accepts the same inputs and produces the same outputs as a given system. [IEEE 610] See also simulator.
entry criteria: The set of generic and specific conditions for permitting a process to go forward with a defined task, e.g. test phase. The purpose of entry criteria is to prevent a task from starting which would entail more (wasted) effort compared to the effort needed to remove the failed entry criteria. [Gilb and Graham]
entry point: The first executable statement within a component.
equivalence class: See equivalence partition.
equivalence partition: A portion of an input or output domain for which the behavior of a component or system is assumed to be the same, based on the specification.
equivalence partition coverage: The percentage of equivalence partitions that have been exercised by a test suite.
equivalence partitioning: A black box test design technique in which test cases are designed to execute representatives from equivalence partitions. In principle test cases are designed to cover each partition at least once.
error: A human action that produces an incorrect result. [After IEEE 610]
error guessing: A test design technique where the experience of the tester is used to anticipate what defects might be present in the component or system under test as a result of errors made, and to design tests specifically to expose them.
error seeding: See fault seeding.
error seeding tool: See fault seeding tool.
error tolerance: The ability of a system or component to continue normal operation despite the presence of erroneous inputs. [After IEEE 610].
evaluation: See testing.
exception handling: Behavior of a component or system in response to erroneous input, from either a human user or from another component or system, or to an internal failure.
executable statement: A statement which, when compiled, is translated into object code, and which will be executed procedurally when the program is running and may perform an action on data.
exercised: A program element is said to be exercised by a test case when the input value causes the execution of that element, such as a statement, decision, or other structural element.
exhaustive testing: A test approach in which the test suite comprises all combinations of input values and preconditions.
exit criteria: The set of generic and specific conditions, agreed upon with the stakeholders, for permitting a process to be officially completed. The purpose of exit criteria is to prevent a task from being considered completed when there are still outstanding parts of the task which have not been finished. Exit criteria are used to report against and to plan when to stop testing. [After Gilb and Graham]
exit point: The last executable statement within a component.
expected outcome: See expected result.
expected result: The behavior predicted by the specification, or another source, of the component or system under specified conditions.
experienced-based technique: See experienced-based test design technique.
experienced-based test design technique: Procedure to derive and/or select test cases based on the tester’s experience, knowledge and intuition.
exploratory testing: An informal test design technique where the tester actively controls the design of the tests as those tests are performed and uses information gained while testing to design new and better tests. [After Bach]
fail: A test is deemed to fail if its actual result does not match its expected result.
failure: Deviation of the component or system from its expected delivery, service or result. [After Fenton]
failure mode: The physical or functional manifestation of a failure. For example, a system in failure mode may be characterized by slow operation, incorrect outputs, or complete termination of execution. [IEEE 610]
Failure Mode and Effect Analysis (FMEA): A systematic approach to risk identification and analysis of identifying possible modes of failure and attempting to prevent their occurrence. See also Failure Mode, Effect and Criticality Analysis (FMECA).
Failure Mode, Effect and Criticality Analysis (FMECA): An extension of FMEA, as in addition to the basic FMEA, it includes a criticality analysis, which is used to chart the probability of failure modes against the severity of their consequences. The result highlights failure modes with relatively high probability and severity of consequences, allowing remedial effort to be directed where it will produce the greatest value. See also Failure Mode and Effect Analysis (FMEA).
failure rate: The ratio of the number of failures of a given category to a given unit of measure, e.g. failures per unit of time, failures per number of transactions, failures per number of computer runs. [IEEE 610]
false-fail result: A test result in which a defect is reported although no such defect actually exists in the test object.
false-pass result: A test result which fails to identify the presence of a defect that is actually present in the test object.
false-positive result: See false-fail result.
false-negative result: See false-pass result.
fault: See defect.
fault attack: See attack.
fault density: See defect density.
Fault Detection Percentage (FDP): See Defect Detection Percentage (DDP).
fault masking: See defect masking.
fault seeding: The process of intentionally adding known defects to those already in the component or system for the purpose of monitoring the rate of detection and removal, and estimating the number of remaining defects. [IEEE 610]
fault seeding tool: A tool for seeding (i.e. intentionally inserting) faults in a component or system.
fault tolerance: The capability of the software product to maintain a specified level of performance in cases of software faults (defects) or of infringement of its specified interface. [ISO 9126] See also reliability, robustness.
Fault Tree Analysis (FTA): A technique used to analyze the causes of faults (defects). The technique visually models how logical relationships between failures, human errors, and external events can combine to cause specific faults to disclose.
feasible path: A path for which a set of input values and preconditions exists which causes it to be executed.
feature: An attribute of a component or system specified or implied by requirements documentation (for example reliability, usability or design constraints). [After IEEE 1008]
field testing: See beta testing.
finite state machine: A computational model consisting of a finite number of states and transitions between those states, possibly with accompanying actions. [IEEE 610]
finite state testing: See state transition testing.
formal review: A review characterized by documented procedures and requirements, e.g. inspection.
frozen test basis: A test basis document that can only be amended by a formal change control process. See also baseline.
Function Point Analysis (FPA): Method aiming to measure the size of the functionality of an information system. The measurement is independent of the technology. This measurement may be used as a basis for the measurement of productivity, the estimation of the needed resources, and project control.
functional integration: An integration approach that combines the components or systems for the purpose of getting a basic functionality working early. See also integration testing.
functional requirement: A requirement that specifies a function that a component or system must perform. [IEEE 610]
functional test design technique: Procedure to derive and/or select test cases based on an analysis of the specification of the functionality of a component or system without reference to its internal structure. See also black box test design technique.
functional testing: Testing based on an analysis of the specification of the functionality of a component or system. See also black box testing.
functionality: The capability of the software product to provide functions which meet stated and implied needs when the software is used under specified conditions. [ISO 9126]
functionality testing: The process of testing to determine the functionality of a software product.
glass box testing: See white box testing.
hazard analysis: A technique used to characterize the elements of risk. The result of a hazard analysis will drive the methods used for development and testing of a system. See also risk analysis.
heuristic evaluation: A static usability test technique to determine the compliance of a user interface with recognized usability principles (the so-called "heuristics").
high level test case: A test case without concrete (implementation level) values for input data and expected results. Logical operators are used; instances of the actual values are not yet defined and/or available. See also low level test case.
horizontal traceability: The tracing of requirements for a test level through the layers of test documentation (e.g. test plan, test design specification, test case specification and test procedure specification or test script).
hyperlink: A pointer within a web page that leads to other web pages.
hyperlink tool: A tool used to check that no broken hyperlinks are present on a web site.