Firstly, I would like to applaud the way the course is structured. It is very systematically designed so that in each level, all the important concepts of the current as well as preceding levels needed to be utilised in order to complete the rigorous assignments. Especially, Level 9 was very challenging. It requires a combination of mathematics, programming and finance. Coincidentally, I read Dr. Duffy’s post somewhere during the same time which said “The first 90 percent of the code accounts for the first 90 percent of the development time. The remaining 10 percent of the code accounts for the other 90 percent of the development time.” Personally, I found the forum discussions and TA’s prompt responses extremely useful. Thanks to Dr. Duffy, Avi, Baruch College and QuantNet.