Rule base.

A component of production rule system that represents knowledge as “if-then” rules.

Safe care.

Safe care involves making evidence-based clinical decisions to maximize the health outcomes of an individual and to minimize the potential for harm. Both errors of commission and omission should be avoided.

Safety incident.

Defined by the National Research Council as an event that, under slightly different circumstances, could have been an accident.


Components of logic system that specify the meanings of the well-formed expressions of the logical language.


Components of the frame system that describe objects.


A property of logic system that every sentence derived from a set of sentences is also a valid consequence of that set of sentences.


A set of characteristics or quantities that describes features of a product, process, service, interface, or material. The description can take many forms, such as the definition of terms, specification of design and construction, detailing of procedures, or performance criteria against which a product, process, and other factors can be measured (National Research Council, 1995).


Routine collection and review of data to examine the extent of a disease, to follow trends, and to detect changes in disease occurrence, such as infectious disease surveillance, postmarketing surveillance, etc. (van Bemmel, 1997).


Synonomy supports multiple nonunique names for concepts.

Syntactic aspect of knowledge representation language.

The way in which information is stored in an explicit format. Also known as notational aspect of knowledge representation language.


The rules (grammar) for the description, storage, and transmission of messages or for the composition of a program statement (van Bemmel, 1997). The rules that specify the legal symbols and constructs of a language (Shortliffe et al., 2001).


Terminologies define, classify, and in some cases code data content.

User interface.

A conceptual layer of a system architecture that insulates the programs designed to interact with users from the underlying data and the applications that process those data (Shortliffe et al., 2001).

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