Cognitive stimulation therapy may be offered to people with dementia, with the purpose of activating and stimulating cognitive and social functions. A Cochrane review has demonstrated consistent evidence that such interventions improve cognition in people with mild to moderate dementia. Data also indicate improvements in quality of life and well-being. However, the studies included where of variable quality e.g. because of small sample sizes, limited details of the randomisation method, and dissimilar procedures for interventions. Further research of higher quality is recommended.