"Robert Mager published the second edition of his book Preparing Instructional Objectives in 1975 (first edition1962). It was an attempt to bring some rigour to the often woolly world of education and training by making learning professionals start with clear goals. It essentially says, start with the end point and work backwards. Additionally, his Criterion Referenced Instruction (CRI), an extension of Gagne’s method of instruction, is a method for the design and delivery of training. His aim was to produce a more rigorous and precise approach to the design of learning experiences based on competences and assessment that relate to defined learning or performance objectives."