  Within a search session users often apply different search terms, as well as
different variations and combinations of them. This way, they want to make sure
that they find relevant information for different stages and aspects of their
information task. Research questions which arise from this search ap- proach
are: Where do users get all the ideas, hints and suggestions for new search
terms or their variations from? How many ideas come from the user? How many
from outside the IR system? What is the role of the used search sys- tem? To
investigate these questions we used data from two experiments: first, from a
user study with eye tracking data; second, from a large-scale log analy- sis.
We found that in both experiments a large part of the search terms has been
explicitly seen or shown before on the interface of the search system.
