Introduction and Definition
For the classification of the research designs, the approach needed to collect the primary data, is very commonly used. For solving this particular purpose, there are two options we can observe the events, people, behavior, conditions etc.

Also we can use the other alternative option which involves communicating with the people about the various topics. Now in this article, we will study about the survey method which is used a lot as a social survey and finds maximum use where the published data is available.

So this method is the technique used for carrying out the investigation processes with the help of direct observation or by the collection of the data by conducting interviews etc. The survey method is a very essential and a useful tool to gather the evidence relating to the various social problems.

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Following are the types of Interview methods widely used for data collection in Research Methodology

A. According to the formality
(a) Formal interview –
• Set of well defined questions are presented by the interviewer.
• Answers are noted down according to the given rules.

(b) Information interview –
• Full authority is with the interviewer for carrying out the needed alterations in the various questions.

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Introduction and Meaning
The collection of the meaningful data, that is able to work as information at a certain stage of research methodology is a necessity in today’s marketing oriented competitive world. For this purpose large number of methods or techniques are available but verbal method is used very commonly for the collection of the data is the “Interview method”.

According to Vivien Palmar, “the interview constitutes a social situation between the two persons, the psychological process involved requiring both the individuals mutually respond through the social research. The purpose of the interview calls for a varied response from the two parties concerned”.

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The process which involves the selection of the sample but does not involve its composition is called as the sampling method. There are different methods for carrying out the sampling process and these methods can be categorized as follows –

a. Probability Sampling – Studying different methods for the sampling is very important as its study helps in the improvement of the precision, accuracy, efficiency etc. of the different sample results, as these are very much dependent on the actual method that is being used.

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Sampling Frame
A sampling frame can be defined as the list consisting of the units of the population. One very necessary and critical point to be kept in mind in case of the sampling frame is that it should be made up to date and also it should be free from the various errors of the omission and duplication of the sampling units. In many cases, it has been observed that the preparation of the sampling frame sometimes becomes a very critical practical problem.

A perfect frame is the one that is able to identify each element only once and these frames are very rarely available in the real life.
A sampling frame may consist of different types of defects and these defects can be classified on the following lines:-
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