Chunking also helps to understand complex topics, say trade between China and India.  First study China: the people, the culture and the economy.  Then summarize and put what you learned in your own simple language. [P] Repeat the process for India.  Then study trade itself: the mechanics, benefits and problems. [4.3] Again, simplify to form an underlying idea. [4.4] At the end, you might just have summarized several books onto one napkin.