2) Organizations often consider on-staff industrial/organizational psychologists as cost with no revenue return. What can industrial/organizational psychologists do to demonstrate their value to organizational leaders?
For clarification, please know that the first pdf document (Stability in IO)lists the various theories of the field, which in their explanation, are basically indicating how trends in the theories of the field, have changed over the years, so it provides an overview of the development of the field, in theory.
The second attached document (Intro to IO) contains a chapter about the field's historical development.
These chapter abstracts are meant to be aid in further reading about the topic and for you to be able to build a more elaborate answer based on ...
Industrial/organizational psychology historical development