Building Reliable Systems: An Introduction

Requirements Gathering & Specification

The initial phase of any software project is defining the needs. This involves collecting detailed requirements from stakeholders, documenting them precisely, and ensuring they are testable. Ambiguous or incomplete requirements are a primary source of errors later in development.

Techniques like user stories, use cases, and functional specifications are employed to capture these requirements. A well-defined specification acts as the blueprint for the entire project.

Design Principles & Architectural Patterns

Software design focuses on structuring the code and system components to meet the requirements. Key principles include modularity, separation of concerns, and loose coupling.

Architectural patterns like the Model-View-Controller (MVC) pattern are commonly used to organize software into distinct layers, promoting maintainability and reusability.

MVC: Input -> Model -> View -> Output

Coding Standards & Version Control

Establishing coding standards ensures consistency and readability across the codebase. These standards often include naming conventions, commenting practices, and code formatting rules.

Version control systems like Git are indispensable for managing changes to the source code effectively. They enable collaboration, track revisions, and allow developers to revert to previous versions if needed.

Testing & Quality Assurance

Thorough testing is crucial for identifying defects and ensuring the software meets quality standards. Different types of tests include unit tests, integration tests, system tests, and acceptance tests.

Test-driven development (TDD), where tests are written before the code, can significantly improve code quality and reduce debugging time.

Defect Density = Total Defects / Software Size

Frequently asked questions

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Everything above runs in your browser — open SPH Fluid and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.