The MacCAT-CA is a 22-item structured interview for the pretrial assessment of adjudicative competence. This instrument uses a vignette format and objectively scored questions to standardize the measurement of three competence-related abilities. Understanding capacity for factual understanding of the legal system and the adjudication process. Reasoning ability to distinguish more relevant from less relevant factual information and the ability to reason about the two legal options: pleading guilty or not guilty. Appreciation capacity to understand his or her legal situation and circumstances.