An Information Retrieval Logic Model : Implementation and Experiments

Two methods defining a logic model for Information Retrieval are introduced. The first one is based on the conditional logic as suggested by van Rijsbergen, while the second is based on the Nie's variations of the uncertainty principle of van Rijsbergen. A Hypercard based system has been also designed and implemented to support small-scale experiments. It has been used to evaluate the performance of the new model in comparison with the standard retrieval methods. Though we imposed some simplifying assumptions to the model in order to have a workable system, the experimental results allow us to claim that the new methods are comparable to the already existing ones.