The success of any training relies more on what follows the training than the training itself. Some of those who atend training workshops will take the learning concepts and behaviours covered and apply and develop it back in the workplace. Some organisations will have set up an approach and follow-up processes linked to their appraisal processes, others may have a less rogorous monitoring process.
Thus the approach to training can be an expectation of the training automatically resolving the training needs - the application of the new skills, learning and behaviours back into tyhe workplace can be overlooked. We call this The Training Dream.
The Reality is significantly different. As you can see from these links, the cost effectiveness of training can be reduced significantly by not developing some form of follow-up process.