Issue No. 04 - April (1985 vol. 5)
Tapio Takala , Helsinki University of Technology
Since practical designing involves both ?bottom-up? and ?topdown? approaches, a CAD system should be able to cope with all types of data.
Tapio Takala, "User Interface Management System with Geometric Modeling Capability: A CAD System's Framework", IEEE Computer Graphics and Applications, vol. 5, no. , pp. 42-50, April 1985, doi:10.1109/MCG.1985.276456