Single-Responsibility Principle

• A module should be responsible to one and only one user
• A class should have only one reason to change (correct)
• A module should be responsible to multiple users
• A class should have multiple reasons to change

• To make a class more robust (correct)
• To couple two things that change for different reasons
• To make a class more efficient
• To make a class more versatile

• Separating the content of a report from the format of a report (correct)
• Having a module that compiles and prints a report
• Having a module that is responsible to multiple users
• Having a module that is responsible to one user