A product roadmap is essential for guiding the strategic direction of mobile app development. A roadmap is designed to communicate the “why” behind what you’re building. When you begin your development project, it’s important to remember that a roadmap is not set in stone; instead, it is made to accommodate change.
http://customerthink.com/how-to-create-a-product-roadmap-for-mobile-app-success/
The fundamental responsibility of a Product Manager is to be the company’s leading expert on the customer. In fact, Product Managers often act as mediators between their customers and design teams to identify where their product or service is lagging and ensure that the underlying needs for their online customer are aligned with their service or product offering. Online feedback serves as a great way for connecting product performance and customer expectations.
https://mopinion.com/product-managers-collecting-online-feedback/