Introduction to Software Design Principles

We will start with what Introduction and then expand over the definition of SOLID.

1. Introduction

• Software design principles represent a set of guidelines that helps us to avoid having a bad design.
• Associated to Robert Martin who gathered them in “Agile Software Development: Principles, Patterns, and Practices".
• According to Robert Martin there are 3 important characteristics of a bad design that should be avoided:
  • Rigidity: It is hard to change because every change affects too many other parts of the system.
  • Fragility: When you make a change, unexpected parts of the system break.
  • Immobility: It is hard to reuse in another application because it can't be disentangled from the current application.

2. What does SOLID stands for?

• S: Single responsibility principle.
• O: Open close principle.
• L: Liskov's substitution principle.
• I: Interface segregation principle.
• D: Dependency inversion principle.

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Tags: SOLID principles, class design principles, Software Design

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