Software Development Fundamentals Summary

Programming Fundamentals

  • Software Development Steps
    • Requirements Definition
    • Determining Specifications
    • Design
    • Development
    • Integration
    • Testing and Debugging
    • Installation
    • Maintenance

Waterfall Model

  • Definition: A structured approach to software development where each stage must be completed before the next one begins.
  • Stages:
    • Define requirements
    • Determine specifications
    • Design system
    • Develop system
    • Integrate components
    • Testing
    • Installation
    • Maintenance

Agile Methodology

  • Characteristics:
    • Agility: Fast delivery of working software
    • Adaptive: Solutions refined based on ongoing feedback
    • Progressive: Regular delivery of working versions
    • Collaborative: Close interaction between developers and clients

Comparison of Waterfall and Agile

  • Waterfall:

    • Client Interaction: Minimal
    • Emphasis: Upfront planning and estimation
    • Disadvantages: Limited flexibility on changes

  • Agile:

    • Client Interaction: Encouraged
    • Emphasis: Rapid adaptation to changes
    • Disadvantages: Difficult to estimate delivery timelines if changes are frequent.

Requirements Definition

  • Define user needs precisely to avoid costly corrections later.
  • Tasks of Business Systems Analyst:
    • Analyze systems
    • Determine requirements
    • Design new systems

Determining Specifications

  • Functional Specifications: Input/output based features
  • Non-Functional Specifications: Critical system functions without specific input/output

Design Phase

  • IPO (Input, Process, Output) Diagrams: Breakdown of software processes to clarify data handling
  • Critical to developing algorithms and data structures

Testing Phase

  • Types of Testing:
    • Alpha testing
    • Beta testing
  • Validate that outputs meet original specifications using real test data.

Installation Methods

  • Direct Cut-over: Full replacement after training.
  • Parallel: Old and new systems run simultaneously.
  • Phased: Introduction of new system in parts.
  • Pilot: Single system trial before full implementation.

Maintenance

  • Ongoing updates and repairs post-deployment to ensure functionality.
  • Importance of monitoring performance and user reception.