Abstract
Access control is the granting and enforcement of priveleges to access information in a system. The design of access control for knowledge base systems is based on access control concepts found in database systems. Additional characteristics found in knowledge base systems include object-oriented features as well as temporal information and predicative assertion languages to describe rules and constraints. Of particular complexity is the implication of access control on inherited objects, rules and constraints. The Group Security model provides users with discretionary access control to objects in a knowledge base system according to their requirement for a task. Further benefits and opportunities are achieved as a result of implementing access control in knowledge base systems.
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