I think 9-member boards are often a bad idea because they tend to have lots of people who are shallowly engaged, rather than a smaller number of people who are deeply engaged, tend to have more diffusion of responsibility, and tend to have much less productive meetings than smaller groups of people. While this can be mitigated somewhat with subcommittees and specialization, I think the optimal number of board members for most EA orgs is 3–6.
I think 9-member boards are often a bad idea because they tend to have lots of people who are shallowly engaged, rather than a smaller number of people who are deeply engaged, tend to have more diffusion of responsibility, and tend to have much less productive meetings than smaller groups of people. While this can be mitigated somewhat with subcommittees and specialization, I think the optimal number of board members for most EA orgs is 3–6.