How does the UX layer impact the customer's experience with the product?

The Lean Canvas model was introduced by Ash Maurya in his book "Running Lean: Iterate from Plan A to a Plan That Works". This book provides a detailed explanation of the Lean Canvas model and how to compile key metrics.

Another book that can be useful is "Lean Analytics: Use Data to Build a Better Startup Faster" by Alistair Croll and Benjamin Yoskovitz. This book provides insights into how to measure and analyze the right metrics for a lean startup.

Finally, "The Lean Startup: How Today's Entrepreneurs Use Continuous Innovation to Create Radically Successful Businesses" by Eric Ries also provides valuable insights into key metrics for lean startups.

Some strategies for testing the effectiveness of the UX layer include user testing, where you observe users interacting with your product to identify any issues or areas for improvement. Another strategy is A/B testing, where you compare two versions of your UX design to see which performs better. Surveys and feedback forms can also be used to gather user opinions on the UX design. Finally, analytics can be used to track user behavior and identify any patterns or trends that might indicate issues with the UX design.