A REVIEW OF SEPARATE AND JOINT STRATEGIES FOR THE USE OF DATA ON REVEALED AND STATED CHOICES

This paper examines recent developments in household travel surveys th at collect data for use in transportation planning and modeling effort s. The paper then introduces the notion of a total survey design and e laborates on what is means by this concept. This is done first in the context of standard surveys of revealed choices. The paper discusses a spects of content and respondent burden and illustrates the potential to reduce respondent burden through careful consideration of content, question design, and question ordering. The paper also explores some i ssues of survey ''friendliness'' particularly with respect to activity surveys versus time-use surveys, with some observations about the pot ential of time-use surveys to eliminate some of the burden and content problems of previous diary designs. The remainder of the paper concen trates on the issue of collecting stated-response data and examines tw o alternative methods for collection: simultaneous collection of the c ontextual information and ''on-the-fly'' development of the alternativ es for the stated-response questions, or sequential collection of cont extual data and development of the stated-response questions. The pape r also addresses issues of respondent burden that arise in the adminis tration of stated-response surveys. The paper concludes with explorati on of some of the reasons for collecting stated-response data, with pa rticular emphasis on the US situation. In conclusion, the paper stress es again the need for a total design concept for collection of stated- response data, as well as for the simpler collection of more standard revealed choice data.