Development and Evaluation of Automotive Speech Interfaces: Useful Information from the Human Factors and the Related Literature

Table 5

Task performance statistics from selected studies (S: speech; M: manual).

Study	Task completion time	Speech recognizer rate	Task completion rate
Carter and Graham [17]	S > M	92.7%
Forlines et al. [18]	S < M (18.0 versus 25.2 s)
Garay-Vega et al. [19]	S (dialog-based) > M; S (query-based) < M
Gärtner et al. [20]	S > M; Simple: 24.6 versus 12.8 s; Complex: 74.4 versus 58.7 s	79.4% (recognition error rate: 20.6%)
Minker et al. [9]	S < M (63 versus 84 sec)		S < M (79 versus 90%)
Ranney et al. [24]	No difference
Shutko et al. [25]	S < M (except dialing phone)
Villing et al. [27]	S > M