Level 3: Evaluating at this level attempts to answer the question - Are the newly acquired skills, knowledge, or attitude being used in the everyday environment of the learner? For many trainers this level represents the truest assessment of a program's effectiveness. However, measuring at this level is difficult as it is often impossible to predict when the change in behavior will occur, and thus requires important decisions in terms of when to evaluate, how often to evaluate, and how to evaluate.
For your team you should be able to use the same type questions you used prior to the learning event. You did do a pre-training assessment didn't you?
Look at it this way. If you were to stand behind someone working before and after the training what would you see? In most cases very experienced employees and top performers can tell you exactly what to look for. Those observations become the criteria for your assessment.
Here's an example, when call center agents become proficient you can actually see how they access information and navigate screens differently than beginners. That's a true behavioral change.
Before I would ask for feedback from supervisors on employee's post training performance I would ask the employees for feedback on what the organization is doing to reinforce, promote, reward the new behavior. In doing so the clear message is sent that leadership has an improtant role in insuring new learnings make the move from classroom into the workplace.
For my clients I use a 10-15 item post-training support survey.