Fact-finding missions for gross human rights violations

Regional human rights courts can organize so-called fact-finding missions when confronted with human rights violations. Both the Inter-American and African Court of Human Rights may, if necessary, organize such missions when confronted with cases involving gross and/or large-scale violations of human rights, while the European Court of Human Rights seems to have become rather  reticent on the issue. The question arises whether (or not) it is expedient for regional human rights courts to organize fact-finding missions in certain circumstances.