Mary R Parker* (mparker@austincc.edu) and Hunter Ellinger (hunter@ellinger.org).
Differences in perspective between teachers and developers can impede efforts to make full use of the expanded opportunities for free instructional apps, even when both parties have a deep understanding of the mathematics involved. A mathematics professor and a software developer, each with decades of experience in their respective fields, report on how they overcame these difficulties when developing a set of open-source web apps. These specific apps enhance statistics instruction, but the lessons learned apply broadly to the development of educational apps. http://visualize.tlok.org/
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