Summary

This is the end of lesson 11. In this lesson, we have learned :

	Overview of User Interface
	Types of user interface
	Principles for Good User Interface Design
	Designing a Dialogue

In the next lesson, we will discuss the fourth phase involved in system development life cycle; system implementation. The purpose of system implementation is to build a properly working system, install it in organization, replace and old systems, preparing system and user documentation and train users.