title: [Validation of questionnaires].
abstract: The development of a questionnaire or a measuring instrument is a laborious and complex process and requires verification of its usefulness before implementation. We present a methodological work on the psychometric characteristics of assessment instruments and analysis of their main features, reliability and validity.
authors.affiliation: Unidad de Investigación, Fundación Española de Reumatología, Madrid, España.
authors.forename: M A Jesús
authors.initials: MA
authors.lastname: García de Yébenes Prous
authors.forename: Francisco
authors.initials: F
authors.lastname: Rodríguez Salvanés
authors.forename: Loreto
authors.initials: L
authors.lastname: Carmona Ortells