Hello, please could I be really cheeky and ask if anyone has a few spare moments, could they see if they have a copy of this paper? My uni doesn't.
Dietrich, H. and F. Ehrlenspiel "Cognitive Interviewing: A Qualitative Tool for Improving Questionnaires in Sport Science." Measurement in Physical Education and Exercise Science 14(1): 51 - 60. It's on Informa world.