This document discusses factors that can cause solutions to fail due to poor product fit. It identifies several reasons why solutions may be too big, heavy, incorrectly shaped, or durable. Additionally, it notes solutions can fail due to being too complex for a user's needs, or due to improper or lack of integration. The document contrasts individual versus group decision making and available data versus time constraints. It closes by listing additional barriers like users' inability to envision solutions, lack of user input, champions, costs of change, single purpose products, and poor training.