There are two meaning to the word puzzle in these two lines right? What is happening? "by first separating the multiple pieces of the puzzle into different categories..." Here it is puzzle where you have to put together the pieces and here "One useful key for addressing such puzzles is to visualize an event or trend aspart of the end result of some unknown process." It means like Riddle right? -From the book World Politics, Trend and Transformation by Charles W. Kegley, Jr and Shannon L. Blanton.