This paper reviews and discusses the notions of interactivity and dynamicity of learning systems in relation to information technologies and design principles that can contribute to interactive and dynamic learning. It explores the concept of dynamic interactive learning systems based on the emerging generation of information as part of a continuous research process in the area of Learning Systems Design. It proposes the addition of a "dynamicity" dimension to interactive learning systems design to reflect the continuous changes in information technologies, learners' needs and increasing availability of information. The paper concludes with a proposed model that reflects the concept of a dynamic feedback and adjustment mechanism that is generally missing from many learning systems. (Contains 6 figures.)