This was a constant worry for Project Connect schools. See the previous question. The trick is to find safe zones where it won't hurt you to be honest. We have many pressing things that come with starting a school. Another thing that we learned in Project Connect is that action plans for sharing don't have to involve a grandiose design.
Simple initiatives are fine.
Over time, they add up until a strong relationship has been established. Because in the long run, it benefits the charter school movement. The second part of the theory can't be proven unless charter schools share what they're learning with other public schools.