Interfacing De-Mystified PDF Informational from Londa

This is a set of information I wrote as part of a class I taught on Pattern Review years ago.  It is also the information I shared in a class by the same name at my retail storefront.  I review Interfacing - what it is, where and how it is used:  both sew-in and fusibles.  
When is it best to use which type of interfacing? 
How are they best applied? 
Do you pre-shrink...or not? 
What are my 'Desert Island Have-to-Have' ones that I always keep in my personal sewing stash? 
While it was written years ago, I did update it in March 2017 to reflect current interfacings available.  However, manufacturer's products and which ones my supplier carries constantly changes, so please see this document as a good guide, but not necessarily current with product specific names.  
For $5, I think you will find it useful and informative.