Peter Honey and Alan Mumford developed a 'Learning Styles Questionnaire' to evaluate a person's learning preferences.
This guide from the University of Leicester explains the characteristics of the four learning styles (activist; theorist; pragmatist and reflector).
The Myers-Briggs Type Indicator (MBTI) is a personality test, based on Carl Jung's theories of psychological type.
Myers-Briggs Foundation - explanation of the sixteen personality types.
The Felder-Silverman model was originally defined in a journal article: Felder, R. M. and Silverman, L. K., 1988. Learning and teaching styles in engineering education. Engineering education [online], 78 (7), 674-681.
The Index of Learning Styles is a questionnaire used to assess a learner's preferences according to the Felder-Silverman model (active/reflective; sensing/intuitive; visual/verbal and sequential/global).
A summary of learning styles and strategies explains the four dimensions of learning style preferences in the Felder-Silverman model.