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[[Image:Specification and Levels of Development.jpg|thumb|360px|Systems engineering model of Specification and Levels of Development. During system development a series of specifications are generated to describe the system at different levels of detail. These program unique specifications form the core of the configuration baselines. As shown here, in addition to referring to different levels within the system hierarchy, these baselines are defined at different phases of the design process.Note: There is one minor (and ironic) typo in the image above. SI&T is "System Integration and Test" not "System Integration and Text". ]]
{{software development process}}
A '''functional specification''' (also, ''functional spec'', ''specs'', ''functional specifications document (FSD)'', ''functional requirements specification'') in [[systems engineering]] and [[software development]] is a document that specifies the functions that a system or component must perform (often part of a requirements specification) (ISO/IEC/IEEE 24765-2010).<ref>[http://www.iso.org/iso/catalogue_detail.htm?csnumber=50518 ISO/IEC/IEEE 24765:2010 Systems and software engineering — Vocabulary]</ref>
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