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Background  One of the most difficult issues for care staff is the manifestation of challenging behaviour among residents with dementia. The first step in managing this type of behaviour is analysing its triggers. A structured assessment instrument can facilitate this process and may improve carers’ management of the situation. This paper describes the development of an instrument designed for this purpose and an evaluation of its content validity and its feasibility and practicability in nursing homes.    Methods  The development process and evaluation of the content validity were based on Lynn’s methodology (1998). A literature review (steps 1 + 2) provided the theoretical framework for the instrument and for item formation. Ten experts (step 3) evaluated the first version of the instrument (the Innovative dementia-oriented Assessment (IdA®)) regarding its relevance, clarity, meaningfulness and completeness; content validity indices at the scale-level (S-CVI) and item-level (I-CVI) were calculated. Health care workers (step 4) evaluated the second version in a workshop. Finally, the instrument was introduced to 17 units in 11 nursing homes in a field study (step 5), and 60 care staff members assessed its practicability and feasibility.    Results  The IdA® used the need-driven dementia-compromised behaviour (NDB) model as a theoretical framework. The literature review and expert-based panel supported the content validity of the IdA®. At the item level, 77% of the ratings had a CVI greater than or equal to 0.78. The majority of the question-ratings (84%,  n  = 154) and answer-ratings (69%,  n  = 122) showed valid results, with none below 0.50. The health care workers confirmed the understandability, completeness and plausibility of the IdA®. Steps 3 and 4 led to further item clarification. The carers in the study considered the instrument helpful for reflecting challenging behaviour and beneficial for the care of residents with dementia. Negative ratings referred to the time required and the lack of effect on residents´ behaviour.    Conclusions  There was strong evidence supporting the content validity of the IdA®. Despite the substantial length and time requirement, the instrument was considered helpful for analysing challenging behaviour. Thus, further research on the psychometric qualities, implementation aspects and effectiveness of the IdA® in understanding challenging behaviour is needed.    Electronic supplementary material  The online version of this article (doi:10.1186/s12913-017-2469-8) contains supplementary material, which is available to authorized users.

bmc health services research

Development and evaluation of the content validity, practicability and feasibility of the Innovative dementia-oriented Assessment system for challenging behaviour in residents with dementia