The design phase of software development deals with transforming the customer requirements as described in the SRS (software requirement specification) documents into a form implementable using a programming language.
The software design process can be divided into the following three levels of phases of design:
Interface design is the specification of the interaction between a system and its environment.
Architectural design is the specification of the major components of a system, their responsibilities, properties, interfaces, and the relationships and interactions between them.
Design is the specification of the internal elements of all major system components, their properties, relationships, processing, and often their algorithms and the data structures.
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