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2. Software design description - Wikipedia

   en.wikipedia.org/wiki/Software_Design_Description

   A software design description (a.k.a. software design document or SDD; just design document; also Software Design Specification) is a representation of a software design that is to be used for recording design information, addressing various design concerns, and communicating that information to the design’s stakeholders.

3. Software design - Wikipedia

   en.wikipedia.org/wiki/Software_design

   One component of software design is software requirements analysis (SRA). SRA is a part of the software development process that lists specifications used in software engineering. The output of the analysis is smaller problems to solve. In contrast, the design focuses on capabilities, and thus multiple designs for the same problem can exist.

4. Software requirements specification - Wikipedia

   en.wikipedia.org/wiki/Software_requirements...

   A software requirements specification (SRS) is a description of a software system to be developed.It is modeled after the business requirements specification.The software requirements specification lays out functional and non-functional requirements, and it may include a set of use cases that describe user interactions that the software must provide to the user for perfect interaction.

5. Formal specification - Wikipedia

   en.wikipedia.org/wiki/Formal_specification

   Because of this, better techniques are needed to assist in the design and implementation of reliable software. Established engineering disciplines use mathematical analysis as the foundation of creating and validating product design. Formal specifications are one such way to achieve this in software engineering reliability as once predicted.

6. Functional specification - Wikipedia

   en.wikipedia.org/wiki/Functional_specification

   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).

7. Formal methods - Wikipedia

   en.wikipedia.org/wiki/Formal_methods

   Formal verification is the use of software tools to prove properties of a formal specification, or to prove that a formal model of a system implementation satisfies its specification. Once a formal specification has been developed, the specification may be used as the basis for proving properties of the specification, and by inference ...