Instead of to cut up work into simple and manageable elements in a top-down way, 3D WBS method defines three elementary and independent tree structures which are the Zones, the Products and the Activities. Then, it crosses them within WBS matrix. The analysis of the whole of the crossings or correspondences provides the exhaustive and scheduled list of project’s tasks, integrating durations, which it remains to export into the planning software, for example MS PROJECT or PRIMAVERA P6.
Thus, no data entering is necessary into the planning tool, it saves a considerable time, and energy also. It is the first factor of reduction of time that 3D WBS method brings.
The second element which saves time is the factorization of Products within WBS matrix. More of that, each elementary information is entered only once, at only one place. Then, during the generation of the schedule or the analysis of all correspondences, information is developed or multiplied, that saves also a consequent time.
It sometimes happened to me to build a schedule of 2,000 tasks on the basis of nothing in only 3 days (I had the data input), whereas generally it takes around 30 days to carry out such a schedule. The time-saving brought by the 3D WBS method and its tools can have a factor 10!