Software Engineering (10th Edition)
Software Engineering (10th Edition)
10th Edition
ISBN: 9780133943030
Author: Ian Sommerville
Publisher: PEARSON
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Chapter 6, Problem 6.1E

When describing a system, explain why you may have to start the design of the system architecture before the requirements specification is complete.

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Architecture design:

It is the high-level structures of a software system and also the discipline of developing such structures and systems. In this the structure includes the software elements, relations among them, and the properties of both elements and relations. It acts as the blueprint for the system and also the developing project, laying out the tasks that are required to be executed by the design teams.

Explanation of Solution

Importance of describing architecture before writing specifications:

  • In a model of software development process, architecture design becomes the first page of the system as it describes how the system is organized as a set of communicating components.
  • It is difficult to formulate the specifications written for the whole system as they increase the complexity. It becomes easier to define the specifications when the system is divided into subsystems. It defines the specifications and also put place it inside the respective subsystem.
  • With this process of developing subsystems and their respective specifications, we can readily jump into the implementation stage. Few reasons behind the fact that the architecture has to designed before specifications are written, are as follows:
  • It provides the structure.
  • The subsystems are developed and their specifications can be written concurrently.
  • It allows the manufacturing of hardware components by sub-contractors and also provides a model for system costing.

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