If you are a scientist you believe that it is good to find out how the world works, that it is good to find out what the realities are, that it is good to turn over to mankind at large the greatest possible power to control the world... It is not possible to be a scientist unless you believe that the knowledge of the world, and the power which this gives, is a thing which is of intrinsic value to humanity, and that you are using it to help in the spread of knowledge, and are willing to take the consequences. - J. Robert Oppenheimer (1904-1967)
Systematically test hypotheses in various conditions in order to determine the utility of the theory .
Theories, hypotheses & research observations Theories Low self-esteem feeds depression Hypothesis People with low self-esteem score higher on a depression scale Test with observations Administer tests of self-esteem and depression. See if a low score on one predicts a high score on the other.
Operationalisation Refers to how a fuzzy psychological construct is actually measured
e.g., the concept of intelligence has been operationalised through a variety of Intelligence Quotient (IQ) tests