Two experimental programs have been carried out on a ground-based simulator in which a number of characteristics of a roll-rate-command/bank-angle-hold system have been investigated for transport aircraft in the approach and landing flight phase. The results indicate that the existing roll response criteria are, in many cases, too lenient. This surprising observation suggests that advanced flight control systems must comply with stricter criteria than conventional systems to obtain the same degree of pilot approval. It is concluded that a pilot, having available a more precise flight control system, increases the internal standard according to which he judges handling qualities. Based on these results existing criteria are redefined and new criteria formats are proposed.