The purpose of this chapter of The United Nations Convention on the Rights of the Child: Taking Stock after 25 Years and Looking Ahead, is to outline the importance of children’s rights monitoring of (international) institutions such as the ICC and to introduce a measurement matrix for undertaking such monitoring. The matrix is specifically developed for monitoring international criminal institutions; however, it can be modified to be used to monitor domestic criminal institutions or even other international institutions. In 2011 Annelotte Walsh examined the extent to which the laws, policies and practice of the International Criminal Court (ICC) in the relation to child victims and witnesses meet child-friendly justice standards as outlined in various international children’s rights treaties and documents.