Research types

Three basic types of research can be identified:
 * 1) Experimental - Characterised by random assignment to groups, with full control over extraneous variables, and manipulation of independent variables
 * 2) Quasi-experimental - Characterised by the study and comparison of naturally-occurring groups
 * 3) Non-experimental - Characterised by study of a single sample, without comparison between groups

For some examples, and to test your knowledge, see the quiz.