Sketchup is a 3D modeling program that can be used to create 3D objects in a 2D environment.
The design process for this package is simple. Start the individual would send me DWG files or Architects drawings to allow me access to the floor plan and check measurements to ensure that the space is to the right scale. Once a brief has been set and an understanding of the desired space has been met, I would import the files into sketch up where I would Create a realistic rendered space.