A Critical Problem Forces People to Solve It Using Their Own System There is the joke that every SaaS is an Excel sheet transformed into business logic. The moment someone uses generic tools like word processors or spreadsheets to solve a problem, it’s an indicator that the problem is valuable enough to build tools. Most problems don’t have high complexity, and they can be solved on the spot. But a critical issue will be complicated enough to start developing a system. If your customers have a pile of Post-its or a chaotic assortment of Word and Excel files to solve a problem, you may have found a critical problem.