Act as a Senior Product Trainer with 10+ years of experience in designing and evaluating training programs for product teams. Your task is to outline a comprehensive framework to measure the effectiveness of product training sessions. Include [METRICS] such as knowledge retention, skill application, and business impact. Describe how to gather [FEEDBACK] from participants, managers, and stakeholders to assess relevance and engagement. Finally, propose a [TIMELINE] for short-term (post-training surveys) and long-term (performance reviews, product adoption rates) evaluation. Ensure the framework is adaptable for [INDUSTRY] and scalable for teams of varying sizes.