document: Development and validation of user-adaptive navigation and information retrieval tools for an intranet portal organizational memory information system Based on previous research and properties of organizational memory , a conceptual model for navigation and retrieval functions in an intranet portal organizational memory information system was proposed , and two human-centred features -LRB- memory structure map and history-based tool -RRB- were developed to support user 's navigation and retrieval in a well-known organizational memory . To test two hypotheses concerning the validity of the conceptual model and two human-centred features , an experiment was conducted with 30 subjects . Testing of the two hypotheses indicated the following : -LRB- 1 -RRB- the memory structure map 's users showed 29 % better performance in navigation , and -LRB- 2 -RRB- the history-based tool 's users outperformed by 34 % in identifying information . The results of the study suggest that a conceptual model and two human-centred features could be used in a user-adaptive interface design to improve user 's performance in an intranet portal organizational memory information system
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