Postscript: emergence of efficiency in health outcomes measurement.

The purpose of this postscript is to comment on psychometric issues raised by the collective articles of this special issue of the Journal of Applied Measurement. Topics discussed include the need to engage relevant literature in the psychometric and larger academic communities, the role of measurement models in psychometrics, and challenges to efficient measurement of patient reported outcomes. Finally, I argue that psychometrics should play "second fiddle" to larger scientific questions.