Meetings are essential, but all too often aren’t managed well. My new online Charity Excellence Framework performance system includes assessing meeting effectiveness and provides resources to help you, but won’t launch until early 2018. In the interim, this is an excellent article by HBR on getting more from your meetings https://hbr.org/2013/12/the-seven-imperatives-to-keeping-meetings-on-track. And why not read about the Coefficient of Inefficiency theory, which attempts to define at what size a committee becomes inefficient - http://psychology.wikia.com/wiki/Coefficient_of_Inefficiency