Are We Selling through the Right Channels? A final step in changing how we think is to revisit our use of selling resources. In practice, we have seen companies fundamentally alter their sales channel models after going through a comprehensive problem-solution mapping and segmentation calibration. Why? Because it is possible that products that appear to have synergy since they are in the same product line may present very different selling challenges. In Part Four, we discuss problem-oriented segmentation concepts that can help guide channel decisions.