Fire-control technology advanced quickly during the years between the "Colossus"-class ships' commissioning and the start of World War I, and the most important development was the director firing system. This consisted of a fire-control director mounted high in the ship which electrically provided data to the turrets via pointers, which the turret crew were to follow. The director layer fired the guns simultaneously which aided in spotting the shell splashes and minimised the effects of the roll on the dispersion of the shells. While the exact dates of installation are unknown, both ships were equipped with a director by December 1915.