 Attending day care centres with programs specifically designed for patients with dementia is believed to postpone admittance to nursing home as well as increase quality of life and well-being for both patients and their family caregivers. We aim to investigate to what degree attendance in day care centres with programs for people with dementia is effective for patient and their caregivers whilst also cost efficient for society. The study consists of a quasi-experimental trial with comparison group. 400 patients with dementia, along with a family caregiver, will be included in the trial. Effects will be measured at baseline, after one and two years. Data collection will be made at three levels; at patient level with measures of cognition, depression, quality of life, functioning in activities in daily living, neuropsychiatric symptoms and death; at caregiver level with measures of depression, level of burden and quality of life; and at societal level with measures of nursing home admittance, hospital stays and use of other health resources. Additionally,a qualitative interview study will include 20 dyads from the main trial. The main focus will be on how attending day care centre programs for patients with dementia affect the lives of both patients and caregivers. Five of these dyads will be followed closely throughout the participation period to be used as case examples. 