<![CDATA[Measurement of children's quality of life can be conducted through several methods, one of which is the KIDSCREEN-27 Health-Related Quality of Life questionnaire. This questionnaire is used to evaluate various aspects of health-related quality of life in children and adolescents, namely physical well-being, seven items on psychological well-being, seven items on autonomy and parent relations, four items on peers and social support, and four items on the school environment. Validity and reliability testing of this questionnaire is necessary because, in medical science, questionnaire measurement is an essential activity to obtain data regarding individuals and events, as well as to ensure scientific integrity so that the instrument measures what it is intended to measure. This study aims to develop an assessment instrument to measure the quality of life of deaf children. The type of this study is research and development (R&D). Conducted at SLB Pontianak, the study involved a sample of 35 deaf children who met the inclusion criteria: being able to read and write, aged 8–18 years, and consenting to participate as research respondents. Sampling was carried out using a simple random sampling technique. The instrument test results of KIDSCREEN-27 showed that 23 out of 27 items were declared valid, as they achieved a Pearson correlation value of ≥ 0.30 and a significance value of < 0.05. Conversely, 4 items were declared invalid because their Pearson correlation value was ≤ 0.30 with a significance value of ≥ 0.05, thereby requiring grammatical revision. Furthermore, the reliability test on the 23 valid items yielded a Cronbach's Alpha value of 0.905, indicating that the instrument possesses excellent internal consistency and is suitable for research data collection.]]>
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