"There are certain actors who are very good at improvising, like Dustin Hoffman and Glenda Jackson"

John Schlesinger's quote speaks to the skill of two of the most renowned actors of their time. Dustin Hoffman and Glenda Jackson are both renowned for their capability to improvise on the spot. This skill is a testimony to their skill and experience as actors. It needs a great deal of imagination and fast believing to have the ability to develop lines and actions that are proper for the scene. Improvisation also needs a lot of trust between the actors and the director, as the director should be able to trust that the stars will be able to come up with something that works. Hoffman and Jackson have both tested themselves to be masters of improvisation, and Schlesinger's quote is a testament to their skill.