The paper develops a system dynamics simulation model to understand the dynamics of immunisation with the aim of aiding decision making process by proposing policies that would enhance immunisation utilization. The model is designed with the intent to show how particular variables influence immunisation demand and coverage rather than predict immunisation coverage rates. The paper applies syste...

Background: Feedback is an essential element of the educational process for clinical trainees. Performance-based feedback enables good habits to be reinforced and faulty ones to be corrected. Despite its importance, most trainees feel that they do not receive adequate feedback and if they do, the process is not effective. Aims and methods: The authors reviewed the literature on feedback and pre...

Twelve roles are described which are occasionally or frequently assumed to constitute the practice of systems engineering. Some roles fit naturally as life-cycle roles, others fit the Program Management set of roles, while still others are not normally thought of in either group. Interactions between the roles are discussed, and the systems engineering roles assumed by the papers in the inaugur...