May be there are many theories to explain the behavior of individuals. However, I do not know any model used to predict behaviors especially in work settings.
Maybe not very related to your question (psychology domain) but one recent research area in Neuroinformatics is processing brain activities via EEG signals and relate these signals to specific activities. This built model then can be used to predict the behavior in future.
For instance see this:
Rosipal, Roman, Leonard J. Trejo, and Paul L. Nunez. "Application of Multi-way EEG Decomposition for Cognitive Workload Monitoring." Proceedings of the 6th International Conference on Partial Least Squares and Related Methods, Beijing, China. 2009.
I don't understand your asking this question. There are many models used to predict behavior - the literature is filled with them. Almost every published paper includes some model, and any empirical paper is trying to explain behavior. Some come from economics, some from organizations, and some from psychology.
In economics we have the Keynesian Marginal Propensity to Consumer (MPC), a psychological law that predicts on average how much of an additional dollar people will spend. John Maynard Keynes is credited with this law. He place the short term value of MPC at around 70 percent. Many other hypothesis were developed afterwards--relative income, permanent income, and life cycle hypotheses are the most famous ones.
The father of economic, Adam Smith, made psychological assumption is his book the "Wealth of Nation." A famous one is that people have the desire to better their conditions. Another one is that people have the propensity to procreate. These may appear trivial but they are important driver for the creation of wealth of a nation, and employmet..
Besides psychological laws, economist use a set of Great Ratio to predict. They include capital/labor, capital/output, household size, institutional population, and labor force participation rate.