Data Protection Assessment Templates:
A good one from Family Links Network (via IAPP site)
Questions to Ask
My inspiration list when I run out of questions to ask
About the 5 Whys
About PbD
Privacy by Design Strategies (the Little Blue Book) by Jaap-Henk Hoepman (Free)
ICO guidelines on Data Protection by Default
EDPB (European Data Protection Board) Guidelines on Data Protection by Design and Default
Looking for the slides? Find them here (if you share please give credit)