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To support the early geometric design, a CAD system should provide utilities for the rapid capture and iterative development of vague geometric models. This paper presents a pilot system that is being developed based on such a vision. The system has adopted minimum commitment modelling and incremental refinement as the guiding principles. The representation of geometric configuration is based on a parametric and constraint-based geometric design model, and provides a uniform representation of the approximate and precise size and location parameters. A constraint-based mechanism has been developed for processing geometric information. The use of the system in assisting the development of a geometric configuration is also demonstrated. Finally, features and limitations of the system as well as relations to relevant works are discussed, and based on this a number of key research directions are established.<\/jats:p>","DOI":"10.1017\/s0890060400003231","type":"journal-article","created":{"date-parts":[[2010,3,31]],"date-time":"2010-03-31T09:45:42Z","timestamp":1270028742000},"page":"287-310","source":"Crossref","is-referenced-by-count":6,"title":["Prototype system for supporting the incremental modelling of vague geometric configurations"],"prefix":"10.1017","volume":"11","author":[{"given":"X.","family":"Guan","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"A.H.B.","family":"Duffy","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"K.J.","family":"MacCallum","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"56","published-online":{"date-parts":[[2009,2,27]]},"reference":[{"key":"S0890060400003231_ref009","unstructured":"Guan X. , & MacCallum K.J. 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