Metrics in software engineering Sample Clauses

Metrics in software engineering. A software metric is “a measure of some property of a piece of software or its specifications. The purpose of making these measures is to improve the overall quality of what is measured. One needs to measure something in order to improve over it” [Dem86]. [CS577B] gives a good definition of a metric and of the derived concept of indicator: “Metrics can be directly observable quantities or can be derived from one or more directly observable quantities. Examples of raw metrics include the number of source lines of code, number of documentation pages, number of staff-hours, number of tests, number of requirements, etc. Examples of derived metrics include source lines of code per staff-hour, defects per thousand lines of code, or a cost performance index”. The term indicator is used to denote a representation of metric data that provides insight into an ongoing software development project or process improvement activity. Indicators are “metrics in a form suitable for assessing project behaviour or process improvement. For example, an indicator may be the behaviour of a metric over time or the ratio of two metrics. Indicators may include the comparison of actual values versus the plan, project stability metrics, or quality metrics. Examples of indicators used on a project include actual versus planned task completions, actual versus planned staffing, number of trouble reports written and resolved over time, and number of requirements changes over time.” A metric quantifies a characteristic of a process or product: we will consider these two dimensions hereafter. A Product metrics Product metrics include two categories:  Internal product metrics cover properties visible only to the development team. Those are static measure not relying on program execution, as defined by [ISO9126]. It may be applied to a non-executable software product in the development stage. It provides the ability to measure intermediate deliverable (requirements definitions, specifications, source code) and predict the quality of the final product.  External product metrics cover properties visible to the users of a product and applicable to the running software. Note that the ISO9126 standard also defines “quality in use” for a specified context and specified user needs. A finer grained classification is provided by the ISO9126/SQUARE and is detailed in a later section of this document. Internal product metrics include:  Size metrics, providing measures of how big a product is internal...
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