Learning objects (LOs) and computer supported learning settings are topics of high concern in academia and industry. But although hundreds of LO repositories exist these days, LO reuse has not become reality on a broader scale. The nationally funded project CampusContent represents an interdisciplinary research effort investigating question like how must LOs be designed to increase their didactically useful reuse in different learning arrangements and thereby allow the seamless combination of content objects and educational scenarios from different providers. In this paper we present a first analysis of the reasons why LO reusability is still low and introduce a conceptual model of modular leaning content that tries to overcome the conflict...