Hi Bernabe: Good. Prepared teachers do have a plan, have put time and effort into their preparation, have gathered the needed resources and are able to take student questins or unexpected interruptions in stride, seamlessly and calmly transitioning from one topic to the next. This usually doesn't happen by itself, work is involved in order to have good classes. Well prepared classes are noticed and respected by students, and teachers who fail to prepare well may not achieve the learning outconmes they hope for. Regards, Barry