I used to worked for an IT consultancy in the UK and they would get trainers in to do courses a few times a year. There was this course on UML and people told me how great it was but I was very reluctant. My degree had covered UML and syntax for drawing diagrams to me is the most pointless and boring waste of time ever.

Turned out diagrams were just a tool and the real focus was on design. Anyway the teacher for the course was Kevlin Henny. He really is a fantastic speaker. I learnt so much about object oriented design from the course. These days I keep an eye our for any recordings of his talks.

Here is one of his talks if you are interested:
https://youtube.com/watch/...