Older adults frequently encounter difficulties performing daily living activities. Often times these difficulties arise because environmental demands create barriers which hinder task performance. Currently, there is little empirical data that relate environmental demands to functional capabilities of older adults. The concepts and methods of Human Factors Engineering can be used to accomplish this goal. Human Factors views task performance within a systems context and maintains that successful task performance is dependent on a match between task demands and human capabilities. This article will discuss how Human Factors methodologies can be used to analyze problems encountered by older adults performing routine activities. Data from a study concerned with identifying physiological demands associated with personal and instrumental activities of daily living will be used to demonstrate the utility of using this approach.