Using Psychometric Tools during training sessions?

How many companies out there have used some type of psychometric assessment during the training courses and gained from it....

Here are 3 things to consider before getting persuaded by a trainer to purchase their tools.

1. Is it valid? (Does it measure what it is supposed to measure)
2. Is it reliable? (Does the test yield consistent results)
3. What are the norms? (What are the groups of people that the scores are being compared against)