In decentralised countries, such as the United States, Germany and Australia, it is the local authorities who decide what components of teacher performance are to be assessed and how. In England and Chile, teacher evaluations are defined by the central government, (Manzi, 2010; Sclafani, 2009). In addition, and contrary to what was believed a few decades ago, teaching performance can be assessed in valid, fair and reliable ways. More importantly, it can be carried out in such a way as to be acceptable to teachers, even when the results have an important impact on their professional careers.