University:
Anglia Ruskin University
Course:
BSE1300 | Software Engineering
Academic year:

2021
Views:

464

Pages:

3
Author:

Sharookh N.

SOFTWARE DESIGN Software Engineering ___ Notes Software design is a systematic approach in changing consumer needs into a form that is easy to work with in software development. When it comes to formulation of user requirements, an SRS (Software Requirement Specification) document is created while a set of more specific and detailed software requirements is compiled for coding and implementation. The software as a product can be directly implemented in any programming language. Software design is the core activity within the Software Development Life Cycle (SDLC) which moves focus towards the solution of the problem domain. It aims to explain how to realize the needed functionality to match the requirements described in the SRS document. Levels of Software Design Design of software yields three levels of results as follows: Architectural Design – The architectural design is the highest abstract version of the system. It identifies the software as a system with large number of components interacting with each other. The designers gain a high-level perspective of the solution and this step is intended to provide them with it. High level Design – The high-level design even breaks 'single entity-multiple component' approach of architectural design into less-abstracted view of sub-systems and modules and shows their how these interact with each other. High-level structure emphasizes on how the system as a whole including all of its parts can be implemented in terms of modules. It acknowledges the modular nature of each sub-system and their relation and inter-dependences with the other. Detailed Design – Detailed design concerns ‘lower’ levels of the design of the system and its sub-systems than the previous two designs. It is more deterministic about modules and their implementations. It explains the logical flow of each module and their internal communication in other words the interfaces of all the modules are specified. Changes Introduced by Modulization can be referred to as Developmental Capabilities: ● Easier maintenance - smaller components result to faster repair, modification and servicing of faults ● Different programs can be separated on the basis of the functionality within each program ● Precision can be added to the program very conveniently ● Ability to re-use components with high cohesion ● Enable simultaneous execution Codd ● Concurrent with regard to securities Concurrency In the recent past, every program design upheld the idea of sequenced execution. Your kind of sequenced execution only exhibits that considering the code, logical instructions it will be executed in a way that only a small part of the program in question is executed at a time. That is, there is another program which educators teach and is referred to as modules, there may be a number of these modules but in reality for any given duration all but one would be active. In software design, concurrency is implemented by splitting the software into multiple independent units of execution, like modules and executing them in parallel. Concurrent execution can execute more than one part of the program code at a time. It is necessary for the programmers and designers to recognize those modules, which can be made parallel execution. Example The spell check feature in word processor is a module of software, which runs alongside the word processor itself.