"This view of high-quality teaching requires evaluators to look beyond classroom performance to see the manifestations of effort focused around these five qualities. Like gravitational or electromagnetic fields, these states of mind cannot be observed directly; they are known from their effects. The ball falls from our hand; we label gravity as a cause. Likewise, we label invisible causes in classrooms. We celebrate teacher efficacy when the teacher inspires her students to grow and learn as a result of their hard work together. The invisible force is a growth mind-set. We contrast this with another less effective teacher who complains that the students are not well prepared because the teacher the year before did not prepare them. Although she may not say it directly to the students, it is highly likely the students will sense the frustration. This fixed mind-set blames external forces and limits the teacher's efficacy and ability to interact in proactive ways with children. (Dweck, 2006)."