Isolation

Part of success in Brazilian Jiu-Jitsu is the ability to limit the options of an adversary. If I reach a point where all my opponent's reactions are known, the desired result is almost inevitable. In all facets of jiu-jitsu the ability to predict and control how things happen will more often than not lead to victory. By isolating your adversary to positions where your options are many and theirs are few the success rate of your attacks increases.
Ex: If you watch DDS guys, they operate isolation into funnel systems very well. They initiate their attack sequences from very few places that they know in depth and systematically work toward the desired outcome.