= Hypothesizing =
In order to narrow down the cause of the problem, we can try to formulate an idea of what could have gone wrong. Optimally, we actually go and look for a proof, to see it happen in action, but it's always good to know potential error sources. In general, there are several common types of problems, and from another perspective, a set of common sources for such problems.
=== Visualizing the architecture and algorithm ===