1. A computer system comprising one or more processors programmed to: (a) receive from a user data describing a trade order for trading a security; (b) commence execution of said trade order via one or more trading algorithms; and (c) during said execution, display to said user, via a graphical user interface, information describing characteristic behavior of one or more of said one or more trading algorithms executing said trade order, said information describing characteristic behavior including an indication of trading tactics currently being used by one or more of said one or more trading algorithms executing said trade order.