The document discusses software design principles and processes. It defines software design as deciding how to implement requirements using available technology. The key aspects discussed are: 1) Software design includes systems engineering, software architecture, and detailed subsystem design. 2) Good design following principles like high cohesion and low coupling makes a project easier to implement, maintain and test. 3) The design process involves architectural design, class design, user interface design, and other phases.

1. Software Design Introduction to Software Engineering College of Computer Studies De La Salle University - Manila

5. Why Design? Maintain With design Without design Implement Test Design Implement Test Maintain

7. Phases in the Design Process Ian Sommerville. Software Engineering, 6 th Edition.

21. Example: Layer Cohesion Object-Oriented Software Engineering (www.lloseng.com)

31. Example of Control Coupling public routineX(String command) { if (command.equals("drawCircle") { drawCircle(); } else { drawRectangle(); } } Object-Oriented Software Engineering (www.lloseng.com)

33. Example of Stamp Coupling public class Emailer { public void sendEmail(Employee e, String text) {...} ... } public class Emailer { public void sendEmail(String name, String email, String text) {...} ... } Using simple data types to avoid it: Object-Oriented Software Engineering (www.lloseng.com)

34. Example of Stamp Coupling public interface Addressee { public abstract String getName(); public abstract String getEmail(); } public class Employee implements Addressee {…} public class Emailer { public void sendEmail(Addressee e, String text) {...} ... } Using an interface to avoid it: Object-Oriented Software Engineering (www.lloseng.com)