ICS 3UI - Introduction to Computer Science ICS 3MI - Computer and Information Science ICS 3MI - Computer and Information Science ICS 3UI - Introduction to Computer Science The Software Development Life Cycle (SDLC) Also known as the Classic Life Cycle Model or the Linear Sequential Model (or) the Waterfall Model. What is SDLC? The software development life cycle is the entire process of formal, logical steps taken to develop a software product. This step-by-step process enables programmers to use their time more efficiently and helps to design error-free logic for their programs. This model is based on the following: Analysis/Requirements Design Code Test and debug Maintenance

ICS 3UI - Introduction to Computer Science ICS 3MI - Computer and Information Science ICS 3MI - Computer and Information Science ICS 3UI - Introduction to Computer Science The Software Development Life Cycle (SDLC) 1. Analysis/Requirements Define the problem using the three step problem-solving approach or the six step problem-solving model. You must have a clear idea of what data (or input) are given and the relationship between the input and the desired output. 2. Design Plan the solution to the problem. Find a logical sequence of precise steps that solve the problem. Such a sequence of steps is called an algorithm. Every detail, including obvious steps, should appear in the algorithm. Flowcharts, pseudo code and top-down charts are three methods that are used to help break a problem into a sequence of small tasks the computer can perform to solve the problem. Sample data should also be used to test the logic of the algorithm by hand to help ensure that it is correct.

ICS 3UI - Introduction to Computer Science ICS 3MI - Computer and Information Science ICS 3MI - Computer and Information Science ICS 3UI - Introduction to Computer Science The Software Development Life Cycle (SDLC) 3. Code - Translate the algorithm into a programming language. 4. Test and debug Locate and remove any errors in the program. Testing is the process of finding errors in the program, both coding errors and logic errors. Debugging is the process of correcting errors that are found. 5. Maintenance Documentation is intended to allow another person, or the programmer at a later date, to understand the program. Documentation can be either internal or external. Internal documentation consists of statements within the code of the program that are not executed but are there to explain what the code is designed to do. External documentation can consist of online instructions to the user such as a detailed description of what the program does and how to use the program. It could also be offline instructions such as a user manual.

ICS 3UI - Introduction to Computer Science ICS 3MI - Computer and Information Science ICS 3MI - Computer and Information Science ICS 3UI - Introduction to Computer Science The Software Development Life Cycle (SDLC) This is known as the waterfall model of software development.

ICS 3UI - Introduction to Computer Science ICS 3MI - Computer and Information Science ICS 3MI - Computer and Information Science ICS 3UI - Introduction to Computer Science The Software Development Life Cycle (SDLC) There is a certain amount of backtracking in the actual evolution of a piece of software of any complexity, particularly if the software is constantly being updated. The Iterative Model reflects this.

ICS 3UI - Introduction to Computer Science ICS 3MI - Computer and Information Science ICS 3MI - Computer and Information Science ICS 3UI - Introduction to Computer Science The Software Development Life Cycle (SDLC) After testing, usually (i.e. almost always) some problems are found that must be analyzed again and then they must be made to conform to the required specifications, which in turn may require design changes and then must be re-implemented (coded). This process must be continuously repeated until the product can be released (i.e. it is perfect).

ICS 3UI - Introduction to Computer Science ICS 3MI - Computer and Information Science ICS 3MI - Computer and Information Science ICS 3UI - Introduction to Computer Science The Software Development Life Cycle (SDLC) Questions or Comments?

ICS 3UI - Introduction to Computer Science ICS 3MI - Computer and Information Science ICS 3MI - Computer and Information Science ICS 3UI - Introduction to Computer Science The Software Development Life Cycle (SDLC) https://www.youtube.com/watch?v=9STHYg7igIQ