[OLA - Optimizing quality of life of elderly people.  Development of quality measurement tools for nursing homes and assisted living organizations]. 
There are no systematically used quality measurement instruments for nursing homes in Switzerland.  That is why a private organization developed its own quality measurement tools.  This article describes the development of a questionnaire for satisfaction of family members of nursing home residents.  The aim was to construct a valid and reliable instrument.  Background for the construction of the items were problem-based interviews with relatives, knowledge from literature as well as know-how from management and a master's prepared nurse.  Factor analyses of 145 questionnaires showed the following themes: "your relationship to the staff", "relationship of staff members to residents", "everyday life in the institution", "the institution as home for your family member" and "know-how of staff".  These themes are consistent with the literature.  Cronbach's alpha of these factors was between 0.78 and 0.91.  The instrument meets the requirements of both science and practice.