Not because their members are careless. Because the conditions that produce those mistakes are structural and almost universal: scarce meeting time, uneven expertise, a full agenda before the investment report arrives. The adviser presents, the committee listens, and a decision is made, sometimes with confidence, often with an uncertainty that nobody voices.
The ten patterns described in this guide have been observed consistently across NFP investment committees operating under real constraints. Each is correctable. Most are avoidable if the right structures are in place. None of them require the board to become investment experts. All of them require the board to govern actively.