AIDS Dementia Complex (ADC) is a subcortical dementia often associated with HIV disease. Despite undergoing numerous assessments of cognition and function to determine their need for personal care assistance, there is limited information on how individuals with ADC view their functional and cognitive impairments and the subsequent effect on their lifestyle. This study investigated issues of concern to clients with ADC in order to provide a greater understanding of the psychological effect of the loss of functional ability. A qualitative design was used to explore individuals' experience of ADC and clarify their insight and perception regarding the loss of function. The participants were selected by the use of purposeful sampling techniques. Information was obtained through semi-structured interviews and analysed using an analytic induction method. Five main themes were identified as being important in relation to the perception of functional ability. Discrepancies emerged between the insights of individuals with ADC regarding their level of function and their need for assistance and support with activities of daily living, compared with those of the health care workers involved in their care. Health care workers need to have an awareness of the insight that individuals with ADC may have into their functional ability when addressing issues of supported accommodation and level of assistance required.