There appears to be the assumption that participating in professional  
development improves instruction.  I would not be surprised to find an  
small positive effect but could it be that the 'better" instructors  
attend PD while the others.....


Roger Berg
Strategic/Community Planner
Literacy Program of Greater Plymouth at the Plymouth Public Library
11 Hall Street
Plymouth, MA 02360
508 746 6345
roger_berg at mac.com
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