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The initial notion of Frames or Scripts as they were also called is that they would establish the context for a problem and in so doing automatically reduce the possible search space significantly. The idea was also adopted by Schank and Abelson who used it to illustrate how an AI system could process common human interactions such as ordering a meal at a restaurant.<ref>{{cite book|last=Schank|first=Roger|title=Scripts, Plans, Goals, and Understanding|year=1977|publisher=Lawrence Erlbaum|___location=Hillsdale, New Jersey|author2=R. P. Abelson|doi=10.4324/9780203781036 |isbn=9781134919666 |url=https://content.taylorfrancis.com/books/download?dac=C2007-0-06021-9&isbn=9781134919666&format=googlePreviewPdf}}</ref> These interactions were standardized as Frames with slots that stored relevant information about each Frame. Slots are analogous to object properties in object-oriented modeling and to relations in entity-relation models. Slots often had default values but also required further refinement as part of the execution of each instance of the scenario. I.e., the execution of a task such as ordering at a restaurant was controlled by starting with a basic instance of the Frame and then instantiating and refining various values as appropriate. Essentially the abstract Frame represented an object class and the frame instances an object instance. In this early work, the emphasis was primarily on the static data descriptions of the Frame. Various mechanisms were developed to define the range of a slot, default values, etc. However, even in these early systems there were procedural capabilities. One common technique was to use "triggers" (similar to the database concept of [[Database trigger|triggers]]) attached to slots. A trigger is simply procedural code that have attached to a slot. The trigger could fire either before and/or after a slot value was accessed or modified.
As with object classes, Frames were organized in [[Subsumption relation|subsumption]] hierarchies. For example, a basic frame might be ordering at a restaurant. An instance of that would be Joe goes to
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