CRC/C/GC/24 available diversion measures and non-custodial sentences, in particular measures that avoid resorting to judicial proceedings. Consideration should also be given to the possible use of new technologies such as video “court appearances”, while noting the risks of others, such as DNA profiling. There should be a constant reappraisal of what works. VII. Data collection, evaluation and research 113. The Committee urges States parties to systematically collect disaggregated data, including on the number and nature of offences committed by children, the use and the average duration of pretrial detention, the number of children dealt with by resorting to measures other than judicial proceedings (diversion), the number of convicted children, the nature of the sanctions imposed on them and the number of children deprived of their liberty. 114. The Committee recommends that States parties ensure regular evaluations of their child justice systems, in particular of the effectiveness of the measures taken, and in relation to matters such as discrimination, reintegration and patterns of offending, preferably carried out by independent academic institutions. 115. It is important that children are involved in this evaluation and research, in particular those who are or who have previously had contact with the system, and that the evaluation and research are undertaken in line with existing international guidelines on the involvement of children in research. 19