Thanks for mentioning Sinek above. I really resonate with his stuff and have used it in my own work and work with the credit union. Our board has decision making framework and also focuses on our vision, mission and values. These are reviewed regularly. When more challenging subjects are discussed we try to have additional resources to provide more education and information. It could a speaker or articles or management or a board member. Discussion is important to understand perspectives. When it is a highly critical discussion we do a round table rather than just some weighing in.
I truly believe this has to be a process that is evolving depending on the situation / the board members / economy and etc.