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Search engines are the preferred tools for finding information on the Web.They are advancing to be the common helpers to answer any of our search needs.We use them to carry out simple look-up tasks and also to work on rather timeconsuming and more complex search tasks. Yet, we do not know very much aboutthe user performance while carrying out those tasks -- especially not forordinary users. The aim of this study was to get more insight into whether Webusers manage to assess difficulty, time effort, query effort, and task outcomeof search tasks, and if their judging performance relates to task complexity.Our study was conducted with a systematically selected sample of 56 people witha wide demographic background. They carried out a set of 12 search tasks withcommercial Web search engines in a laboratory environment. The results confirmthat it is hard for normal Web users to judge the difficulty and effort tocarry out complex search tasks. The judgments are more reliable for simpletasks than for complex ones. Task complexity is an indicator for judgingperformance.

Ordinary Search Engine Users assessing Difficulty, Effort, and Outcome for Simple and Complex Search Tasks