Soft science is an emerging comprehensive science that comprehensively uses the theories and methods of natural sciences, social sciences, and mathematics and philosophy to solve various complex social problems brought about by the development of modern science and technology. It studies economics, science, technology, and management. The internal links between social links such as education and their development laws provide optimized solutions and decisions for their development. According to the above definitions, Which of the following are not soft sciences: _____. ['Psychology.', 'Management.', 'Forecasting.', 'Decision Science.']