Definition Differences

Your coworker calls you in the middle of the night with a data modeling emergency. There needs to be a single definition for Customer in the data warehouse, yet he was provided with three different Customer definitions. Each definition was provided by a well-respected business expert and is accurate within that business expert’s area. He needs you to recommend a tactic he can use to come up with a definition that satisfies all three business experts. What tactic would you recommend?