This document discusses instructional design, including its definition, justification, and types of models. Instructional design is defined as systematically analyzing, developing, implementing, and evaluating the processes and resources aimed at improving learning. It is based on learning theories, information technology, systematic analysis, and management methods. There are two main types of instructional design models - micromorph models which use physical or visual replicas, and paramorph models which use symbolic or verbal descriptions and can be conceptual, procedural, or mathematical models describing relationships between components.