This research project was a systematic evaluation of the effects of a personalized system of prosthetic aids to memory established in the home environment for individuals with mild to moderate dementia. The system of aids developed were in the form of a free-standing "Memory Center" unit. Caregivers were responsible for actively training their relatives to use the aids to compensate for deficits in orientation and memory for information necessary for daily functioning. The investigation was conducted in two phases, using a modified multiple baseline across subjects design. The two clients in Phase I met research criteria for Alzheimer type dementia and received a clinical dementia rating of moderate progression. Of the three clients in Phase II, two satisfied research criteria for Alzheimer type dementia, while one met research criteria for vascular dementia. All three were determined to have mild dementia. The effects of the intervention on the clients and the caregivers were examined over a four week intervention period and at a one month follow-up. The primary question addressed was whether clients could be trained to effectively use the prosthetic aids to orient themselves and compensate for deficits in memory function. This was assessed via daily assessments of verbal orientation. Weekly ratings of the behavioral functioning of clients were provided by the caregivers. And finally, caregivers rated their own stress and mood levels on a weekly basis throughout the study. Although the rates of learning varied, all of the clients increased their levels of verbal orientation following the introduction of the prosthetic aids and training. Evidence for generalized effects on the behavioral functioning of the clients was found. Overall, the clients were rated as expressing fewer negative emotions and as evidencing more oriented behaviors and less confused and disturbed behaviors during the intervention and at follow-up. Overall, the caregivers reported a consistent pattern of decline in their levels of stress and dysphoric mood. A common area of improvement was a reduction in negative emotions felt and expressed toward their relatives. Factors related to the success of the intervention and potential causal elements of change were discussed. Finally, recommendations for clinical practice and future research were provided. / Ph. D.