In order to evaluate and validate the informal, self-directed learning that happens outside of the school, one must first consider the type of informal learning that is under question. In general, there is no efficient way to evaluate informal training outside the school other than by checking practical skills in whatever area that which the knowledge is to be checked in.
For instance, people usually get trained in communication skills and professional ethicsoutside the school in their work places. Conducting an MCQ based test to test one’s professional ethics or emotional intelligence would be a good way to evaluate such learning.