This article was co-written by renegade psychologist, James C. Coyne. I'm not highlighting it for any specific relevance to ME/CFS. It is just an example of a type of problem that can occur in questionnaires which I thought might be interesting to the odd person to highlight. The paper is summarised in the first part of this blogpost: http://jcoynester.wordpress.com/201...-constructing-a-title-for-a-scientific-paper/ The paper requires a bit of attention. However, I imagine it would be quite a bit less work to read if one skipped the Methods and Results sections. Here's an extract from the introduction: I once observed some questionnaire responses from ME/CFS patients (unpublished study) which looked like there were some errors in the responses due to inattention. I will now have a name and reference for this sort of problem.