A very good article no doubt and the conclusion that SIP is not great in bull market is also true. The main problem is one knows that the market was all along only bull AFTER the event.There is no way to predict that the market will remain ONLY in bull phase for over twelve months beforehand or even during that period. Secondly,it may be possible that even in this continuos bull phase there can be reactions or side ways movements and you may be lucky to have invested on these days through SIP. And thirdly,If one had the money to invest in the beginning!!