For those of you who supervise people, what 'management style' have you found to be the most effective?

I’m interested to know for those who work in environments where they’re supervising not only superiors but also front line staff, what basic principles you adhere to to make your management the most effective.

Do you have a specific management style? Do you have any mottos or credos? Do you have credibility with your staff, and do they trust you?

I’m thinking about branching out into a different aspect of my current career and would love to know what works for you.