In this tutorial, I'll cover how to troubleshoot and repair discontinuities in a polysurface. This video was made to specifically help a user who wanted to maintain the form of a model while achieving better continuity between surface edges. 

Here's the before file if you'd like to follow along with these steps. Troubleshooting_Discontinuity.3dm

The Rhino forum can be found here http://discourse.mcneel.com/