The DOMENG project has introduced the Domain Engineering Process to the space community as a first stone on the roadmap to build a model-based and reused- oriented software production system, based on the analysis and modelling of the Space domain. At the current stage, the first iteration of the domain engineering process is close to an end and this paper presents some of the main outcomes of the study: the models for the Space domain, focused on Space Avionics Embedded Software Systems Domain. The Space domain models have allowed us to outline the fundamentals of the DOMENG High Level Architecture (DoHLA), an OBSW generic architecture based on the DOMENG domain model that combines a component-oriented approach with schedulability and dependability issues.