The Cognitive Failures Questionnaire.
The cognitive failures questionnaire is a 25 item questionnaire regarding everyday mistakes people make.
Items are scored on a 4-0 scale, with the total scale score calculated as a sum of the items.
There are sub-scores that can be calculated for: forgetfulness, distractibility and false triggering.
Broadbent, D.E., Cooper, P.F., FitzGerald, P., & Parkes, K.R. (1982). The Cognitive Failures Questionnaire (CFQ) and its correlates. British Journal of Clinical Psychology, 21, 1-16.