title: Quality of life and its measurement: important principles and guidelines.
abstract: BACKGROUND
  The importance of the valid assessment of quality of life (QOL) is heightened with the increased use of the QOL construct as a basis for policies and practices in the field of intellectual disability (ID).
  
  
  METHODS
  This article discusses the principles that should guide the measurement process, the major interrogatories (i.e. who, what, when, where, why, and how) of QOL measurement, issues and procedures in the cross-cultural measurement of QOL, and the current uses of QOL data.
  
  
  RESULTS
  Based on the above methods, the article presents a number of important guidelines regarding QOL measurement.
  
  
  CONCLUSIONS
  From a measurement perspective the use of the QOL construct is changing. Initially it was used as a sensitizing notion, social construct, and unifying theme. Increasingly, it is being used as conceptual framework for assessing quality outcomes, a social construct that guides quality enhancement strategies, and a criterion for assessing the effectiveness of those strategies. This new role places additional emphasis on the valid assessment of one's QOL.
authors.affiliation: INICO, University of Salamanca, Salamanca, Spain. verdugo@usal.es
authors.forename: M A
authors.initials: MA
authors.lastname: Verdugo
authors.forename: R L
authors.initials: RL
authors.lastname: Schalock
authors.forename: K D
authors.initials: KD
authors.lastname: Keith
authors.forename: R J
authors.initials: RJ
authors.lastname: Stancliffe
mesh_terms: D003469:Culture; D004532:Ego; D006801:Humans; D008607:Intellectual Disability / Q000523:psychology; D011788:Quality of Life / Q000523:psychology*; D012938:Social Perception