The KINDLR is a generic instrument for assessing Health-Related Quality of Life in children and adolescents aged 3 years and older. The original version of the questionnaire, the KINDL, was developed by Prof. Monika Bullinger in 1994. Prof. Ulrike Ravens-Sieberer & Monika Bullinger revised the KINDL developing the KINDLR in 1998.

The KINDLR has been translated into numerous languages by now and it has been used in numerous German and international studies. Norm values are given based on representative German data from the German National Health Interview and Examination Survey for Children and Adolescents (KiGGS). The KiGGS study is a broad survey realized by the German Robert-Koch-Institute.

The KINDLR provides 24 items and thus is a short, methodologically suitable, psychometrically sound and flexible measure of Health-Related Quality of Life in children and adolescents.

Three different versions of the instrument suitable for different age groups and developmental stages are provided. The KINDLR can be used for children and adolescents between 3 and 17 years of age. Additionally, each version of the questionnaire can be completed both by children and adolescents, and also by their parents.

Besides the paper-pencil version of the KINDLR, a computer-assisted version (CAT-SCREEN) has been developed.

As a generic questionnaire, the KINDLR can be used to assess Health-Related Quality of Life in healthy as well as in ill children and adolescents. However, in order to additionally enable the assessment of Health-Related Quality of life due to chronic diseases, several modules were developed to be used in addition to the core instrument. One module focusses on the Health-Related Quality of life of chronically ill children or children who are actually in hospital, respectively, while other modules aim to assess the disease-/condition-specific Health-Related Quality of Life (for Asthma bronchiale, Diabetes, Epilepsy, Cancer, Neurodermatitis, Obesity and Spina bifida).