5e9513e7_niques_Work__Improved_Feedback__Description
[Technique] Independent Parallel Testing [Feedback Period] Days to weeks. Depends on how often the development team deploys their current working build into the test environment and how long it takes for the test team to get around to testing it (they are likely supporting several teams). [Description] 
The development team may opt to deploy their system on a regular basis, at least once an iteration, to an independent test team working in parallel to the development team(s) that focuses on trying to discover where the system breaks. This is an agile testing strategy.
Why Agile Software Development Techniques Work: Improved Feedback
Description