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The greater the cohesion, the better is the program design. CohesionĬohesion is a measure that defines the degree of intra-dependability within elements of a module. These measures are called coupling and cohesion. There are measures by which the quality of a design of modules and their interaction among them can be measured. They are though, considered as single entity but may refer to each other to work together. As we know, modules are set of instructions put together in order to achieve some tasks. When a software program is modularized, its tasks are divided into several modules based on some characteristics. The spell check feature in word processor is a module of software, which runs along side the word processor itself. It is necessary for the programmers and designers to recognize those modules, which can be made parallel execution.

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In other words, concurrency provides capability to the software to execute more than one part of code in parallel to each other. In software design, concurrency is implemented by splitting the software into multiple independent units of execution, like modules and executing them in parallel. Say, a software has multiple modules, then only one of all the modules can be found active at any time of execution. By sequential execution we mean that the coded instruction will be executed one after another implying only one portion of program being activated at any given time.

Concurrent execution can be made possibleīack in time, all software are meant to be executed sequentially.

Components with high cohesion can be re-used again.

Desired level of abstraction can be brought in the program.

Program can be divided based on functional aspects.

Smaller components are easier to maintain.

Modular design unintentionally follows the rules of ‘divide and conquer’ problem-solving strategy this is because there are many other benefits attached with the modular design of a software. Designers tend to design modules such that they can be executed and/or compiled separately and independently. These modules may work as basic constructs for the entire software. Modularization is a technique to divide a software system into multiple discrete and independent modules, which are expected to be capable of carrying out task(s) independently. It defines logical structure of each module and their interfaces to communicate with other modules. It is more detailed towards modules and their implementations.

Detailed Design- Detailed design deals with the implementation part of what is seen as a system and its sub-systems in the previous two designs.

It recognizes modular structure of each sub-system and their relation and interaction among each other.

High-level design focuses on how the system along with all of its components can be implemented in forms of modules. High-level Design- The high-level design breaks the ‘single entity-multiple component’ concept of architectural design into less-abstracted view of sub-systems and modules and depicts their interaction with each other.

At this level, the designers get the idea of proposed solution domain. It identifies the software as a system with many components interacting with each other. Architectural Design - The architectural design is the highest abstract version of the system.Software design yields three levels of results:

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It tries to specify how to fulfill the requirements mentioned in SRS. Software design is the first step in SDLC (Software Design Life Cycle), which moves the concentration from problem domain to solution domain. The output of this process can directly be used into implementation in programming languages.

Software design is a process to transform user requirements into some suitable form, which helps the programmer in software coding and implementation.įor assessing user requirements, an SRS (Software Requirement Specification) document is created whereas for coding and implementation, there is a need of more specific and detailed requirements in software terms.