In epidemiological research, recall bias is a systematic error caused by differences in the accuracy or completeness of the recollections retrieved (`recalled`) by study participants regarding events or experiences from the past. Sometimes also referred to as response bias, responder bias or reporting bias, this type of measurement bias can be a..... Found on http://en.wikipedia.org/wiki/Recall_bias
Systematic error due to the differences in accuracy or completeness of recall to memory of past events or experiences.
Found on http://www.cirem.co.uk/definitions.html