This article reviews the benefits and issues with online surveys as it relates to response rates, speed of response, representativeness of the samples, and the differences in results due to different survey media. analysis of the response data for four travel-related online surveys showed consistent response patterns. This article demonstrates that an exponential growth model is most appropriate when modeling the numbers of returns over time. The model can predict the final number of returns based on 7 or 8 days’ survey return numbers with a relatively small degree of error. The study suggests that surveying a pilot sample and analyzing their responses can allow a researcher to estimate the parameters of the response model for a large-scale survey and thus conduct a study in a more effective way.