The session is aimed for those who have knowledge (at least basic) of the SOLID design principles. While SOLID is a catchy name, it is still not always intuitive to understand - and more than that, to teach your team - the ideas of those principles and what made them be chosen over others. I had the very same issue when I had to teach my students, and while I started explaining that, I have found a great graphic representation of those principle that makes those five principles as intuitive as arrows on a whiteboard.