A perspective is a concept used by Eclipse to describe a collection of user interface components. For example, Eclipse has built-in perspectives called Java and Java Debug. By installing the Force.com IDE, you’ve added a perspective called Force.com. Figure 4.1 shows the Force.com perspective, indicated in the upper-right corner.
If you do not see the Force.com perspective, click the menu option Window, Open Perspective, Other; select Force.com from the Open Perspective dialog; and click the OK button. The Open Perspective dialog is shown in Figure 4.2.