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An interactive computer graphics software system specifically designed for assessment of multiattribute value functions is described. It is argued that interactive multiattribute assessment package (IMAP) incorporates the major advantages of existing computer packages for multiattribute utility assessment as well as significantly enhanced capabilities for assessing preference independence (PI) conditions on an attribute set. These enhanced capabilities include highly flexible procedures for testing preferential independence and weak difference independence (WDI) that preserve many of the advantages of manual procedures with much less tedium. Capabilities of IMAP not available in existing packages are described in detail.