Every member of the targeted population should have an equal chance of being selected for the survey. The size of the sample to be selected should be adequate to achieve the required level of precision. Probability sampling ensures everyone a fair and equal chance of getting selected which results in avoiding coverage error. The attempt should be to minimize sampling error. The questions to be asked should be simple and clearly worded so that the respondents can understand it and answer it easily. The floating voters make up their mind during election campaigns, the predictions can seriously go wrong, if there is a bandwagon effect in favor of any particular political party. Purposive or quota sampling of voters is popularly used by market research agencies for exit poll where a quota is fixed for sampling the respondents based on different age groups, caste communities, gender, occupational background, education and class.

The choice of survey method is important for election studies to determine whether it is a good survey or a bad survey. This reduces the measurement error though it cannot be totally avoided. As they yield a demonstrative sample, leaving out coverage errors and minimizing the sampling error, election surveys, whether pre or post poll based on a random sample drawn from the voter list of the Election Commission of India are generally accurate.

The sampled respondents who could be contacted and interviewed during the survey should have similar in traits as those who could not be interviewed. Everyone in the sample that responds to the survey should have corresponding characteristics with those who did not respond. This assists in avoiding the crucial non-response error. However, in some cases, the sample size depends upon the disaggregation level for which the data is required. Everyone in the population should have an equal chance of being selected in the sample.

Election studies, done before or during the election campaign, have pointed out that around a quarter of the voters do not decide beforehand about who they are going to vote for and are termed as floating voters by pollsters. The question to be asked should be worded in such a manner that it stimulates the respondents to answer them correctly. The size of the required sample for any survey can be statistically unwavering. For those who do not have the experience could use statistical tables that provide various sample sizes based on the population size of the universe.

In a democratic country the public opinion always does matter and eChunav is one of the online voting platform in India where people come and share opinions.