While the prevailing opinion is that the Dow Industrials isn't a relevant index reflective of the market as a whole, a distinction should be made between a "lagging" index and a "divergent" index. A lagging index is one which is going in the same direction as the other but is not increasing/decreasing at the same rate. A divergence is when one index goes up while the other index is going down. The chart below shows two failures and one divergence between the Industrials and Transports.