The purpose of this study was to perform a prospective, controlled and randomized evaluation of the effectiveness of Mobile Geriatric Teams. The elderly population is increasing in Sweden as well as in other countries. A minority of elderly have multiple concurrent diseases of chronic and / or acute nature, and this group is often described as “frail elderly”. This group is characterized by a high consumption of health care and frequent hospitalizations. Moreover, queuing and a shortage of hospital beds are major problems in Sweden as well as in other countries. New and different ways to meet the needs of care are partially established today in Sweden, but there is a shortage of controlled systematic health-economic evaluations that focus on the results in the consequent changes of consumption of hospitalizations, profiles of drug consumption, outpatient consultations as well as patients, relatives and caregivers qualitative experiences of the care.