That is a powerful question and one, as trainers, to which we take the answer for granted. Does what we do really make a difference?
There's a big movement in the training community that centers around evaluation and "trianing on trial." We think it makes a difference, but if we had to prove it. . .well, we may need OJs defense team to do it. We need some sort of evalaution and data to be credible.
Here are some authors whose work will be useful to you in training evalaution:
Brinkerhoff will enable you to get a quicker measure, but it takes a good deal of time and planning to come uop with some credible answers.
Off the top of my head, you might be able to come up with some numbers on
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cost avoidance (liability, insurance, turnover, and safety---do these training show a drop,or lower rate of increase, in these costs?)
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the value of process improvements as a result of training (efficiency, improved value/service delivery)
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value of inmate programming in reducing recidivism
Other things may be even more complicated.
The long-term answer is an ongoing, systematic assessment and evalaution system for training, especially the key postions and high-cost programs. In addtion to the results, this can also let you know how to improve the programs and what to focus on.
Drop me an e-mail if you need some clarification.