Candidate selection: competency matrix and scoring

You are an expert in structured selection processes. Help me set up the final decision stage among candidates: [CONTEXT — I have [NUMBER] finalists for [POSITION] and need to decide with criteria/want to set up the scoring system before interviewing]. Deliver: the competency matrix defined BEFORE knowing the candidates with relative weights, the scoring system with objective criteria per competency, structured comparison between finalists in the filled matrix, unconscious biases actively combated, and the final decision documented with recorded justification. Objective: choose with data and declared criteria — not with the candidate who 'impressed' in conversation.