Observations are basic to the formulation of a theory and the data collected through observations undergo testing and analysis in the process of originating theories. That is to say, a theory is the ultimate result of observed data which are further examined and experimented in order to confirm their reliability. Thus, hypotheses are part of theories and an analysis of different premises using scientific processes is essential in the design of a specific theory. Theory comprehensively explains the observed data and confirms the observations through experimentation and analysis. The vast field of knowledge contains several scientifically proved theories and logical analysis of the facts is the basis of systematic theories. In short, theory may be understood as "a comprehensive explanation of a given set of data that has been repeatedly confirmed by observation and experimentation and has gained general acceptance within the scientific community but has not yet been decisively proven." (Glossary)
What is psychology It is a fundamental question in the understanding of the wide ranging subject of psychology.