Pre-Post Inventory (PPI)
•Research Summary
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www.pre-post-inventory.com
Behavior Data Systems
Pre-Post Inventory (PPI), Scientific Findings .
Davingnon, D. (2002).
Pre-Post Inventory: Reliability and Validity Study.
Internal report commissioned by Behavior Data Systems.
BDS Research
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Psychometric Essentials
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Pre-Post Inventory (PPI), Scientific Findings .