Why is this? If evaluation is so important and if the means of carrying it out exist, why do evaluations typically consist of little more than the famous “smiles test”? Is it because the interest in evaluating training is feigned? Is it because the costs of evaluating training outweigh the benefits? Is it a case of diminishing returns, that is, the higher up TKM an evaluation goes, the more costly the evaluation and the less valuable the information? Or is it perhaps the case that trainers are the only ones interested in TKM and in going beyond it?