This is a lecture that helps mid-level developers like me draw the overall picture from the beginning of architecture. I was surprised by the meticulous lecture composition that introduces the logic of those who created the concept of architecture back in the 1970s. It is a lecture that helps those who have been developing for several years to organize their experiences because it explains the core content well based on the paper and Martin Fowler's argument. I think this is a lecture that helps improve skills to an intermediate level or higher, and it is a lecture that I feel like a lot of time was spent preparing the lecture. I am grateful to the lecturer who created this lecture.