This book provides a comparative assessment of the procedural law governing facts and evidence with references to over 900 judgments and decisions of the European and the Inter-American Court of Human Rights as well as the UN Human Rights Committee. It identifies underlying principles which govern the procedural law of these international human rights institutions. Based on the premise of a contextualized procedural law governing facts and evidence, the book analyzes where current approaches lack a foundation in the contextualization premise and offers solutions for recurring procedural problems relating to questions of subsidiarity in fact-finding, burden and standard of proof, as well as the admissibility and evaluation of evidence.