Here we want to use Cp for new processes or Pp for processes that are under statistical control . A good analogy is parking a car in a garage. If the car is bigger than the garage, it will not fit within the specification limits and thus is not capable – this case is clear. What about a case when our car is skinnier than the garage you’re trying to park it in (the specification width)? Can we consider our parking process as a capable one? It depends on our specification and the width of the car. Are we satisfied with the probability of 99% that we will park our car, without hitting the wall? This mean that one in a hundred attempts to park our car will hit the wall of the garage!