Tyler. Educational evaluation refers to the process of scientifically judging various educational activities, educational processes and educational results by using certain techniques and methods under the guidance of certain educational values and according to the established educational goals. In 1930s, American educator Taylor put forward the concept of educational evaluation. Ralph Taylor is a famous American educator and an expert in curriculum theory and evaluation theory. He is an important founder of modern curriculum theory and a master of scientific curriculum development theory. Taylor is known as "the father of contemporary educational evaluation" because of his outstanding contributions to educational evaluation theory and curriculum theory. The Basic Principles of Curriculum and Teaching published by him in 1949 is regarded as the Bible of modern curriculum theory.