Multi-perspective analysis of EAST-ADL models Sample Clauses

Multi-perspective analysis of EAST-ADL models. EAST-ADL does not limit the modeller to a single architecture, as HiP-HOPS does. Not only are the Error Model and nominal model separate, but EAST-ADL provides multiple layers or levels of potential modelling as well as different views or perspectives of a model. HiP-HOPS is expected to be applied to EAST-ADL models at the analysis/artefact and design levels, and at these levels EAST-ADL offers a number of different perspectives. At the analysis level, the primary perspective is the Functional Analysis Architecture (FAA), which is a relatively abstract view of the functions of the system. At the design level, the model is more concrete and is separated into the Functional Design Architecture (FDA) or software perspective and the Hardware Design Architecture (HDA) or hardware perspective. Although HiP-HOPS is designed to be able to support iterative analyses at different levels of abstraction, and thus can cope equally well with an initial qualitative analysis of an abstract functional model and a later quantitative analysis of a more detailed component model, it was only designed to support a single perspective. The concept of separating software and hardware perspectives of the same system is without analogue in HiP-HOPS. This is because HiP-HOPS assumes a compositional model that combines hardware and software, with individual software functions (or subsystems of functions) contained within the hardware processors that run them. Therefore, although HiP-HOPS is capable of analysing both software and hardware, it requires them to be in the same model, with the hardware the primary means of failure propagation: it is not possible for failures in one software function to propagate directly to another remote, physically separated software function; instead software failures must propagate up to their parent hardware component and then propagate along hardware connections to other hardware components that carry the affected functions. This can be emulated in EAST-ADL by combining everything into a single perspective, but the advantages of having multiple perspectives are then lost. Instead, HiP-HOPS has been extended to provide native support for multi-perspective analysis: the analysis of failure behaviour across two or more separate perspectives of the same system (e.g. H/W and S/W). This required the introduction of the concept of a 'perspective' to the HiP-HOPS model hierarchy.