  Many ground-based photometric surveys are now under way, and five of them
have been successful at detecting transiting exoplanets. Nevertheless,
detecting transiting planets has turned out to be much more challenging than
initially anticipated. Transit surveys have learnt that an overwhelming number
of false positives and confusion scenarios, combined with an intermittent phase
coverage and systematic residuals in the photometry, could make ground-based
surveys rather inefficient in the detection of transiting planets. We have set
up a working group on transiting planets to confront the experience of the
different surveys and get a more complete understanding of these issues, in
order to improve the observing strategies and analysis schemes for ongoing
surveys, and to prepare for the coming Corot and Kepler space missions. This
contribution presents the current results of our working group.
