Abstract

ion in the context of planning has some tradition, for recent developments see e.g. [Bergmann 96]. It should also be remarked that terms like information and knowledge are used in rather different ways. In [Aamodt 94] e.g. certain relations between data, information and knowledge are investigated. For our purposes it suffices that information is considered as knowledge (in the ordinary sense) about the model. A new piece of information adds something to this knowledge which could not be inferred before. This may be in a twofold manner: (a) Information about the existence of actions or about the values of its parameters may be added. This enlarges the space of possible actions. (b) The uncertainty of the preconditions or the outcome of actions is reduced. This reduces space of possible actions. At planning time one might operate with an incompletely known action as long as a corresponding information providing action which completes the operator description is included before that actio...

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