It is widely held that a free, natural dialogue model is more efficient and less distracting than system-initiative, state based dialogue. This paper describes an evaluation of two systems - one using system-directed dialogue and one using a more "free" dialogue . focusing on distraction and efficiency. The level of distraction is measured using an automotive industry standard test (LCT), and the efficiency is measured by counting the number of completed tasks. The efficiency is increased by 42% using the free, natural dialogue model while the LCT results are unclear. Using a free dialogue model increases the efficiency and reduces the distraction in some cases.
Bibliographic reference. Kronlid, Fredrik / Villing, Jessica / Berman, Alexander / Larsson, Staffan (2011): "Comparing system-driven and free dialogue in in-vehicle interaction", In INTERSPEECH-2011, 817-820.