The essence of generalization is simplification by omission of irrelevant details. In logic, a concept A is a generalization of concept B, if and only if every instance of concept B is also an instance of concept A, and there are instances of concept A that are not instances of concept B. For example, a
Experiments in human development attempt to identify the influence of variables or events on human behavior. These experiments contribute to the shared knowledge of the community that seeks to understand human development by describing the course of human development, predicting how individual humans will develop, and arranging optimal environments for growth. Before experiments can contribute