casestudies childrenwithdisabilities classroommanagement colorado democracyandeducation designsandplans disabledpersons distanceeducation education educationalchange educationalplanning educationalsociology evaluation experimentalmethods freeschools history historyjeffersoncountyopenhighschool jeffersoncounty lc4015s7381979 lc5800 magnetschools mainstreamingineducation management méthodes non-formaleducation preschool schoolmanagementandorganization schools special summerhillschool teaching unitedstates éducation