How do you know which SIT tool to use on your product? That is one of the most common questions from my students and workshop participants. One way to decide is to analyze the current products in the category. You look for SIT patterns that tend to dominate how the product emerged and evolved over the years. I look at recent innovations in the category to spot trends. I also try to identify where the industry might have some "fixedness" about the products and how they are used. The type of fixedness (functional, structural, or relational) can lend insight about which SIT tool to start with.