Aptitude refers to special capacity or capacities. Tests designed to measure capacities, i.e., to predict what one can accomplish with training are called aptitude tests. They serve some useful purposes:

1. Aptitude tests measure mere specific abilities: Mechanical aptitude tests measure various types of eye-hand co-ordination.

2. Selection: Aptitude tests are used for employee selection. They test specific abilities required for a particular job.

3. Career guidance: Aptitude tests also provide career guidance to the student. Aptitude tests help them to select a proper career by discovering the abilities they possess.

4. Prediction: Aptitude tests are used to predict success in various specific professions.