Reusing HCI design knowledge shows potential in allowing practitioners to design based on previously identified concerns. A reuse approach is presented that is based on claims, design knowledge units encapsulating tradeoffs. tal characteristics of reuse include abstraction, selection, specification, and integration. Claim relationships provide the key to instantiating each of these traits within the claims reuse approach. A claims library is used implement a working model of the reuse process. Studies analyzing various components of this work validate existing efforts and provide impetus for future work. KEYWORDS Claims reuse, claims library, reference claims, claims map ACM CLASSIFICATION KEYWORDS H.5.2. Information interfaces and presentation (e.g., HCI): User Interfaces – Theory and methods