My understanding is that if the board appoints a committee to do a certain task, meetings of that committee must follow public meeting laws. In particular, notices of the committee meeting(s) must be posted just like we do for our school board meetings. If, for example, a 7-member board appointed 3 of its members to review a process and then return to the full board with its findings and recommendations, does the meeting of those 3 members need to be posted?
You are correct. If the subcommittee is appointed by or doing business on behalf of the board (even if there are not board members on the subcommittee), the meetings of the subcommittee must comply with public meetings laws.
Conversely, if the superintendent creates an advisory committee, without any direction from the school board of directors, then this committee does not have to follow public meeting laws. This is true even if there are board members on the superintendent’s committee as long as the number of board members are less than a quorum of the board.