The construct of dispositions is well defined in national standards, and U.S. colleges of education are required to assess candidate dispositions to meet accreditation requirements. Measurement, however, is virtually non-existent. On-line reviews of college accreditation reports indicate that colleges are attempting to assess dispositions without the use of sound measurement techniques or adequate definitions of the construct. The end result, of course, is a reliance on face validity. Rasch measurement provides a much needed solution to scaling the dispositions needed for good teaching. This paper presents early work in the development of three related instruments measuring ten national principles related to dispositions. The instruments use different item structures and response formats, which will eventually be combined into a single disposition scale. Current results are promising for the first two components. (Contains 6 tables.)