McDonalds is testing a new diner concept. The trial site in Kokomo, Indiana, will allow customers a choice of either the usual fast food or a sit-down menu in an updated 1950s diner. McDonalds is attempting to achieve its high growth targets by diversifying into other food products and new restaurant formats. With limited growth available in its traditional fast-food market, the new restaurant style may well be the shape of things to come.