The Development of an Instrument to Measure the Work Capability of People with Limited Work Capacity (LWC).

The study did not test whether the questionnaire improves work participation or predicts job behaviour, because criterion-related validity was not assessed. The samples were people with limited work capacity in special education, practical education, vocational training or work training centres, and the mean ages were 17.5 and 17.4 years in study 1 and 26.72 years in study 2, so the results may not apply to all adults with limited work capacity. Convergent and discriminant validity were not assessed because the literacy level of the target group made this difficult. Most observers in study 1 were work-related rather than intimate, and the self-other correlations were relatively low, so observer ratings should not be treated as interchangeable with self-ratings. The total observer coping scale had low internal consistency of .25. The final instrument is not included in the supplied text and must be obtained from the authors. The study tested questionnaire properties, not a treatment or service model, so it cannot show that using the instrument changes clinical practice or employment outcomes.

The supplied text reports funding by the Dutch Employee Insurance Agency UWV.

Do not read this as evidence that the questionnaire improves work outcomes. The paper did not test whether the scores predict work behaviour or work performance.