While gasoline was clearly the main driving force behind the market on Friday, there is little doubt that the Middle East tension also provides some upside momentum for crude.

There is no doubt that software as a service has become a driving force within the software industry. Indications are that customer adoption will continue over the next five years and spending will remain on the rise. The software industry must adopt a new frame of reference for value creation. Software as a service delivery is at the forefront of this trend, and adoption will grow as more customers experience software as a service and the offerings mature, becoming more readily accepted and available in the market.

Water is the driving force of all nature.

This was a modest but not insignificant deal which could be a driving force to make real cuts in agricultural subsidies.

When you want it, where you want it. That's a powerful driving force.

Arsenal have really missed Patrick's driving force in midfield, and they haven't replaced him. They still look lightweight in midfield and keep on dropping points in the league.