Skip to main content

Unit 4 Software development Models

 Software development Model

Software development models are various processes or methods that are chosen for project development depending on the objectives and goals of the project. Many development life cycle models have been developed to achieve various essential objectives. Models specify the various steps of the process and the order in which they are executed.

The few software development models are discussed below:

Waterfall Model (SDLC Model)

The Waterfall Model is a traditional software development model in which the project is developed in sequential phases. Each phase must be completed before moving to the next phase, and there is usually no going back once a phase is completed. It is one of the earliest SDLC (Software Development Life Cycle) models.

1. Features of Waterfall Model

  1. Sequential Phases: Development progresses in a fixed order:
    • Requirements → Design → Implementation → Testing → Deployment → Maintenance
  2. Clear Documentation: Each phase produces formal documentation that guides the next phase.
  3. Easy to Understand & Manage: Because of its step-by-step approach, project progress is easy to monitor.
  4. Well-defined Requirements: Works best when requirements are clear and unlikely to change.
  5. Phase Completion: Each phase has specific deliverables and milestones.

 

2. Advantages of Waterfall Model

  1. Simple & Easy to Use: Very straightforward; easy for developers and managers to understand.
  2. Structured & Disciplined: Clear documentation and defined phases make project management easier.
  3. Early Detection of Errors: Errors in a phase can be detected before moving to the next phase.
  4. Ideal for Small Projects: Works well when requirements are well-known and stable.
  5. Progress Tracking: Easy to measure progress by checking completion of each phase.

 

3. Disadvantages of Waterfall Model

  1. Inflexible to Changes: Once a phase is completed, going back to make changes is difficult and costly.
  2. Poor for Complex Projects: Not suitable for large projects with evolving requirements.
  3. Late Testing Feedback: Testing is done after implementation, so defects may be discovered late.
  4. Customer Feedback Delayed: The client sees the final product only after the implementation phase.
  5. High Risk: If requirements are misunderstood initially, it can lead to project failure.

Comments

Post a Comment

Popular posts from this blog

Function of OS 1. Process Management The operating system helps in running many programs at the same time. It keeps track of each running program (called a process), decides which one should run next, and stops or starts them as needed. It makes sure that all the programs get a fair chance to use the CPU.   2. Memory Management The OS manages the computer's memory (RAM). It decides which program will use how much memory and keeps track of it. When a program is closed, it frees up the memory so that other programs can use it. This helps the computer run smoothly without crashing.   3. File System Management The operating system helps us to create, save, open, and delete files. It organizes files in folders and keeps them safe. It also controls who can open or edit a file to protect our data.   4. Device Management The OS controls all the input and output devices like the keyboard, mouse, printer, and monitor. It tells the devices what to do and makes su...
Post a Comment
Read more
  Unit-2 Control Statements in c# A control statement in java is a statement that determines whether the other statements will be executed or not. It controls the flow of a program. Control Statements can be divided into three categories, namely ●         Decision Making statements ●         Iteration (Looping) statements ●         Jump statements ⮚   Decision Making statements Decision making statements help you to make decision based on certain conditions. These conditions are specified by a set of decision making statements having boolean expressions which are evaluated to a boolean value true or false. There are following types of decision making statements in C#. 1) Simple if statement:   It is the most basic statement among all control flow statements in C#. It evaluates a Boolean expression and enables the program to enter a block of code if the ...
1 comment
Read more
    Basic Structure Of Java Program   // 1. Package Declaration (optional) package mypackage;   // 2. Import Statements (optional) import java.util.Scanner;   // 3. Class Declaration public class MyProgram {       // 4. Main Method – Entry point of the program     public static void main(String[] args) {           // 5. Statements – Code to be executed         System.out.println("Hello, World!");     } }   1. Package Declaration (Optional) A Java program may begin with a package declaration that defines the folder or package name in which the class is stored. For example: package mypackage; This helps organize code into different logical groups.   2. Import Statements (Optional) After the package declaration, import statements can be added to include built-in or user-defined Jav...
Post a Comment
Read more