According to lean development principles, developing a mobile application is a process that includes a sequence of phases -- design, development, release, feedback collection, modification to redesign, and so on -- with the aim of ensuring the successful development of an app at a minimal cost. User feedback is an indispensable part of the product life cycle and the basis to determine its evolution.
https://www.infoq.com/articles/effectively-collect-user-feedback-mobile-apps/