Although no unified definition of the concept of search strategy in
  Information Retrieval (IR) exists so far, its importance is
  manifest: non-expert users, directly interacting with an IR system,
  apply a limited portfolio of simple actions; they do not know how to
  react in critical situations; and they often do not even realize
  that their difficulties are due to strategic problems.
  
  A user interface to an IR system should therefore provide some
  strategic help, focusing user's attention on strategic issues and
  providing tools to generate better strategies.  Since neither the
  user nor the system can autonomously solve the information problem,
  but they complement each other, we propose a collaborative coaching
  approach, in which the two partners cooperate: the user retains the
  control of the session and the system provides suggestions.  The
  effectiveness of the approach is demonstrated by a conceptual
  analysis, a prototype knowledge-based system named FIRE, and its
  evaluation through informal laboratory experiments.