I think I am a big fan of textual UML after I learnt it from thoughtworks techradar. I doubted it after my recent experience. In the past 2 months I spent long periods of time to think of how to make my Powerpoint slides pass my boss Lim Chee Kiam's standard. I thought deeply about that. One moment, I asked myself why Grady Booch, Ivar Jacobson, and James Rumbaugh didn’t come out a diagram which cater to dynamic(behaviour) and static (structure) diagrams, then I realized it will be a mess if those two things are put toghere.