A new workflow, consisting of separating multidisciplinary feasibility evaluation from detailed engineering, has been used on several projects. This workflow decreases cycle time necessary to plan a well because only alternatives that are viable for all disciplines go through detailed analysis. The basis of this method is the combination of a shared Earth model with advanced 3D visualization techniques and quick but precise evaluation tools. Use of constraints to define default values makes it simple to plan targets and wellbores, with only 3D interactive graphic editing.