How Can a Content Team Keep Its Brand Voice Consistent Across Multiple Writers?

We have several people writing for the same company, and the pieces are all accurate, but they don’t always sound like they came from one place. One writer is quite formal, another is conversational, and small differences in terminology keep slipping through.

What actually helps a team build useful brand voice guidelines that writers will follow without making every article sound identical? I’d be interested in practical approaches for reviews, examples, or editorial checklists.