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Discipline: Math
Topic: Estimation
Product: PhET Labs Interactive Simulations
Vendor: PhET Labs
Cost: All PhET simulations are available free of charge from the PhET Website
Technical requirements: Java and Flash
Accessibility info: Accessibility and PhET
For additional information contact phethelp@colorado.edu
Link to Lab: Estimation
Reviews: Research-based simulations of physical phenomena
Description: All of PhET simulations are extensively tested and evaluated
Instructional materials: instructor and lab manuals available online from PhET Websites
Case studies: PhET Research Page

Over One Hundred Million Simulations Delivered: A Case Study of the PhET Interactive Simulations