The plan is typically developed by the school staff, while review and approval of the plan is the responsibility of the School Site Council. The requirement for each school to have a WSIP not only comes from BPS administration, but also from language in the Boston Teachers Union contract.
Attached below is the Edison's WSIP for the 2010-11 school year. The first document is a narrative (two pages) and the second is the full document (38 pages). This document was discussed at the 10/29/10 meeting of the School Site Council, and has since been approved by BPS.
Last year's WSIP can be found here.