For creating educational systems, each developer usually applies different approaches to specific situations, including advanced software engineering techniques. In the case of systems that provide interactivity-intense assignments, problems during their development include difficulties to manage component repositories and the absence of a systematic process to support code reuse. Interactive Uarning Modules (iLM) are systems designed in this context, which also provide key functionalities to facilitate the teacher's work. To address the problems faced during their development, a Domain Engineering is proposed to build iLM. In order to define the iLM software family, this paper presents the core features of existing systems, describes the method used to produce an application framework and how to instantiate it. Restructuration of existing iLM using the proposed Domain Engineering is reported with initial high gains in productivity and system quality.