HISA specifies fundamental requirements for ´information infrastructure´ and healthcare specific middleware
services.
This part of ISO 12967 specifies the fundamental characteristics of the computational model to be
implemented by a specific architectural layer of the information system (i.e. the middleware) to provide a
comprehensive and integrated interface to the common enterprise information and to support the fundamental
business processes of the healthcare organization, as defined in ISO 12967-1. The computational model is
specified without any explicit or implicit assumption about the physical technologies, tools or solutions to be
adopted for its physical implementation in the various target scenarios. The specification is nevertheless
formal, complete and non-ambiguous enough to allow implementers to derive an efficient design of the system
in the specific technological environment which will be selected for the physical implementation.
The computational model provides the basis for ensuring consistency between different engineering and
technology specifications (including programming languages and communication mechanisms) since they
must be consistent with the same computational object model. This consistency allows open inter-working and
portability of components in the resulting implementation.
This specification does not aim at representing a fixed, complete, specification of all possible interfaces that
may be necessary for any requirement of any healthcare enterprise. It specifies only a set of characteristics –
in terms of overall organization and individual computational objects, identified as fundamental and common
to all healthcare organizations, and that are satisfied by the computational model implemented by the
middleware.
Preserving consistency with the provisions of this part of ISO 12967, physical implementations shall allow
extensions to the standard computational model (...abbreviated)