Simplifying

code

Assigning

responsibilities to objects

Reusability

Loose coupling

Optimizing algorithms

Improving

internal structure

Reducing

complexity

Increasing cohesion

An

architectural style

A

reusable object-oriented design

An

interface specification

The

physical grouping of related items

The

strength of relationships

The

logical grouping of related functions

The

coupling between modules

The

connections between modules

The

relationships between classes

The

dependencies between modules 

The

associations between objects

A method

should do only one thing

A

module should do only one thing

A

component should do only one thing

A

class should do only one thing

Implementation should be closed for extension

Implementation should be closed for modification

Software

should be open for modification

Software

should be closed for modification

Optimizing

algorithms 

Defining

software architecture

Meeting

functional requirements

Minimizing

complexity