Image of SofTutor is the fastest way to Learn!
From SofTutor for MicroStation 3D - Comparing Primitive, B-Spline and SmartSurface(TM)
Topics & Keywords covered in this video are:

Comparing Primitive, B-Spline and SmartSurface(TM) Surface UV B-Spline Solids Rule Lines

smartsuface is a trademark of Bentley Systems, Inc.