Hence results returned by existing search methods do not
give the relevant information. It also contains an assumption
that user query is static and it is keep on iterating the query
until the required information is retrieved [27], [23]. In
reality, users learn during the search process to go through
the information, read the titles in result sets, and read the
retrieved documents themselves, viewing list of topics related
to their query terms, and navigating with hyperlinked Web
sites.
One of the major problem in Web search system is user and
system communication i.e., there is a huge gap between user
model and system model. The user model will translate
information needed by them into a query form in the
language supported by the system, which convey some
meanings to the system model. There are many issues in the
user model, the first one is that, as a result of reading and
learning from the information encountered throughout the
search process, the users information needs, and consequently
their queries, continually shift [22], [15]. The following
Figure 1. Show the above user and system model interaction.