What is the test for admitting evidence that a person committed a crime?

Evidence Code section 1101, subdivision (b), provides in part that nothing prohibits the admission of evidence that a person committed a crime, civil wrong, or other act (such as motive, opportunity, intent, preparation, plan, knowledge, identity, absence of mistake or accident), when relevant to prove some fact other than his or her disposition to commit such an act. In other words, evidence of other crimes is admissible only if relevant to prove a material fact in issue, separate from criminal propensity. (People v. Demetrulias (2006) 39 Cal.4th 1, 14.)