This document discusses different methods for getting useful customer feedback at various stages of product development. It outlines open-ended customer interviews to learn customer needs at early concept stages. Customer prototype previews help understand how customers see themselves using a prototype product. On-site feedback tools gather insights from beta customers and those hesitant to provide feedback. Heatmap tracking examines where customers are abandoning tasks. Analytics provide data on conversion rates and feature usage to balance feedback. The document provides guidance on when to use each method and questions to ask.