Health technology assessment bodies, including those in Australia and the UK, have noted a lack of evidence on the performance of paediatric HRQoL instruments to guide decision making. Feasibility, acceptability, and construct validity are core aspects of understanding the overall performance of a HRQoL instrument. Additionally, understanding the quality of paediatric HRQoL data collected using various methods is crucial. The paediatric multi-instrument comparison (P-MIC) study is the first of its kind to compare concurrent measurement of common generic and disease-specific paediatric HRQoL instruments. This presentation aims to explore the quality of data collected in the P-MIC study, as well as initial feasibility, acceptability, and psychometric results of the EQ-5D-Y-3L, EQ-5D-Y-5L, TANDI and PedsQL.