Task construction is a vital part of an online study. The automated, self-service nature of the study means that there is no room for misinterpretation. You won't be there to clarify tasks or interpret user intentions. The tasks need to be able to reliably speak for themselves.
The following sections outline some points to keep in mind when constructing tasks. Note a couple of things to consider when reading them.
Unless you're really comfortable with your commercial service's functionality for analyzing click paths, we still recommend having some form of answer-based task completion collected—in case you find that there was a technical glitch with collecting clickstream data or that data are cumbersome to analyze, ...