There is an accepted place for the use of carefully validated psychometric instruments as a contribution to personal learning and development. Such methods have to comply with regulations about preservation of anonymity of data collected, validity of the instrument, and permissions which have to be obtained from respondents completing the instruments.
There is also a case to be made for much simpler means of self-assessment. One of my favourite ways of doing this is through the use of multiple choice quizzes. Examples can be found at the end of each chapter of the new edition of Dilemmas of Leadership, a textbook for executives and graduate students. These quizzes were developed for self-study through the internet. In my example I selected a self-assessment approach out of creative desperation when the computer system failed during the revision session of a personal development workshop.