This paper presents a learner-centered model for designing e-leaming assignments/activities within e-learning environments. The model is based on constructivism learning theory. The model includes two categories - the learning design elements (comprised of fundamental design elements and collaborative elements) and the learning assessment elements (self-assessment, team assessment, and facilitator’s assessment). The application of the model is shown through various working examples. A factual situation using the model within an e-learning course is presented to further demonstrate the application of the model in an actual e-learning environment.