The current March/April 2017 issue (Volume 34, Issue 2) of the publication "IEEE Software" contains an article by the authors Niklas Leicht, Ivo Blohm and Jan Marco Leimeister entitled "Leveraging the power of the crowd for software testing". The article describes how companies can utilize the potential of the crowd for testing their software and provides guidelines for doing so.

Abstract:

To profit from crowdtesting, companies can use three approaches: engage an external crowd of Internet users, engage their employees, or engage their customers. Researchers' experiences with these approaches have led to guidelines for establishing crowdtesting.

If you are interested, you can find the full articlehere.