Why has six sigma being in demand and will continue to be in demand? The answer is simple. Most businesses come into existence for one thing, profit. There are a few which are not for profit businesses as well. Let's keep these aside for now. The equation for profits is simple.

Profit is equal to revenue minus cost. In situations where the revenues are low, and the costs are high, profits take a huge beating. In order for any organization to survive, it has to be profitable. Thus, the revenues must be high and the costs must be low.