Progress in improving the credibility of teachers' descriptive evaluation o
f students and residents had not kept pace with the progress made in improv
ing the credibility of more quantified methods, such as multiple-choice exa
minations and standardized patient of examination clinical skills. This art
icle addresses innovative approaches to making the ongoing in-training eval
uation (ITEv) of trainees during their clinical experiences more reliable a
nd valid. The innovations include the development of a standard vocabulary
of describing the progress of trainees from "reporter" to "interpreter" to
"manager" and "educator" (RIME), the use of formal evaluation sessions, and
closer consideration of the unit of clinical evaluation (the case, the rot
ation, or the year). The author also discusses initial results of studies a
ssessing the reliability and validity of descriptive methods, as well as th
e use of quantified methods to complement descriptive methods. Applying bas
ic principles-the use of a taxonomy of professional development and statist
ical principles of reliability and validity-may foster research into credib
le descriptive evaluation of clinical skills.