Development Life Cycle

Program development is the process of creating application programs. It includes: Analysis, Design, Coding, Testing

Analysis

Analysis → Astraction, decomposition, identification of the problem and requirements.

• Decomposition vs Abstraction: Decomposition breaks down into complex problems into smaller parts, which can be subdivided into even smaller parts to solve things more easier. While abstraction keeps the key elements required for the solution to the problem and discards any unnecessary details and informations that is not requires temporily.

Design

Design → Show how the program should be developed, and determine what the software needs, how it looks and the timeline of development to begin to draw up visuals of the end product.

• Example: Structured Diagram, Flowchart, Pseudocode.

Coding

Coding → The programmers work on the design modules, such as input, output and processes, and write code to make each part of the program functional.

Testing

Testing → Testing program code with the use of test data.

• Unit Testing vs Integration Testing: Unit testing is testing each part of the code individually. Integration testing is when all code combined to form a program then its only tested together.

Standard Methods

Computer System is made up of software, data, hardware, communications and people. Each system can be divided up into a set of sub-systems and each can be further divided into sub-systems and so on until each sub-system just performs a single action.

Example: Alarm app on your smartphone is a very small computer system.

→ Components of a computer system; A computer system works by dividing into subsystems. Input, Output, Processes, Storage.

Structured Diagram

Top-down design in a diagrammatic form. Hiearchical with levels.