... [picking up and holding out a smallslat] To make a windmill, insert the yellowbolt through the middle of this short slat andthe middle of another short slat and screw itinto the snowman.USER ... representing the performancedimensions of task success, dialogue quality, anddialogue efficiency, and has been applied to a widerange of systems (e.g., Walker et al., 2000; Litmanand Pan, 2002; M¨oller ... explanations forthis difference. First, the system analysed by Lit-man and Pan (2002) was an information-seekingdialogue system, in which efficient access to theinformation is an important...