Research & innovation Department of Health Economics Wellbeing and Society Resources Department of Health Economics Wellbeing and Society « About the Department Resources Projects Research groups People News & events Find out more about our resources. Informant questionnaire on cognitive decline in the elderly The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE) assesses cognitive changes in older adults based on informant observations, aiding early detection of dementia and cognitive impairment. Read more