Event-driven: Event-driven approach is a leading approach to design a program in which the flow of the program is defined by the events. These events may occur due to mouse click, key press by the user or the message invocation by other programs. This approach is generally used for more interactive Graphical User Interface based applications. Event-driven programs can be written in any programming language and works according to the occurred event and triggering the function behind it.
Data-driven: As the name suggests data driven approach is where the flow of a program is controlled by data itself but not on the logic. Here everything is implied on data only e.g. reading the data, processing it and producing the output.
Object-oriented: This approach is based on real-time objects that contain data as properties and methods as codes. Programs are designed with the help of classes, objects and how they interact with each other within a program. It revolves around the behavior of objects or the storage of data to the objects.
Logical: This paradigm works on logical units rather than functions applied. The complex problems are divided into smaller logical units by using one of the following designs:
o Top-down design: Here the big complex problem is broken into smallest possible modules and these modules are capable of performing specific tasks. Each module is self-sufficient to accomplish the given operations using different logics and structures.
o Bottom-up design: In this methodology, the program design starts with the smallest level of the entities, performing operations on it and then interconnecting them to form a complex level structure. It is used for solving simple problems by starting from its lowest level part until reaching to the highest level.
Methodology for Program Design
Program design methodology deals with the effective implementation of logics and procedures to construct a program in an information system. The methodology defines the analysis, design, implementation, testing and maintenance of the programs.
Planning: This is the foremost phase of program design that defines the problem and the scope of existing system. All the aspects of new program, its objectives and the expected issues are defined along with the feasibility study of cost, time, constraints and security.
Information gathering & Analysis: This process involves the requirements specification and gathering the information about facts, problems and recommendations of the proposed system. Information gathering may be done by interacting with users or using ocumentations and then analyzing how to avoid the issues in existing system.
Design: Here the requirement specification is transformed into a detailed structure of the proposed system using Data Flow Diagrams or pseudo codes.
Implementation: Actual implementation or coding of program is performed in this phase using some programming language. One or more programmers may work step by step to implement a design into real code using structural or modular approach
Testing: All the functions or modules are checked for errors or bugs using various testing techniques and then bug free code runs for actual environment.
Maintenance: Maintenance and support is needed for every software program to be installed on different environments so that it works accurately with the passing time.
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