"Surveys are a fairly exact science. There could be marginal differences in the findings of the various surveys, but not the kind of mismatch being noticed.
"That means the methodology is not being implemented correctly. The credibility of these surveys as such is an issue," party spokesperson Sandip Dikshit told reporters at a AICC briefing here.
Dikshit at the same time made it clear that he was not demanding a ban on surveys.
"If surveys are done correctly, such a big margin in the results will not be there. One agency gave a survey to two television channels and they reported different results. How does this happen? How come such divergent views are coming.
"How can large sample surveys of the same population show different results. Is serious work not being done or are real results not being put out. It is a matter of concern. It does influence public opinion. " he said.