We present a computational model of creative, , design based on collaborative interactive genetic algorithms., , We test our model on floorplanning. We guide the evolution, , of floorplans based on subjective and objective criteria. The, , subjective criteria consists of designers picking the floorplan, , they like the best from a population of floorplans, and the, , objective criteria consists of coded architectural guidelines. We, , support collaboration by allowing individual designers to view, , each others' designs during the evolutionary process and the, , sharing of designs via case injection. This methodology supports, , team design, and reflects the view of creativity that collaboration, , accounts for much of our intelligence and creativity. We present, , a description of the model and a comparative study of floorplans, , created individually versus collaboratively. Our results, , show that floorplans created collaboratively were considered, , to be more "revolutionary" and "original" than those created, , individually.