Unstructured (Oral) Interview: It is not rigid type of interview. In this method, there is flexibility in the entire process of interview. The interview has greater freedom to choose the form depending on situations. The flexibility nature of interview allows the interview to ask number, sequence, and method of questions according to requirements of situations.

Merits of Unstructured Interview : 

• The informal nature of interview creates a congenial atmosphere for effective communication 
• In a highly society of India, the formal set up interview imposes serve limitations on interview. Unstructured interview is the only remedy for this problem

Demerits of Unstructured Interview 

• The informal nature of interview provides respondents to answer differently, this is difficult in analysis of data 
• To administer this type of interview, well trained and skilled persons are required 
• The more number of personal bias and prejudices may be the part of this method.

Merits of Interview method 

• It is possible to obtain highly reliable information and in depth knowledge 
• It is possible to obtain information about the past and also about future plans in a detailed manner.
• There is a high rate of response 
• Interview method can be used with all types of persons.

Demerits of Interview method 

• There is a possibility of misleading information being given by the interview 
• There can be defects due to the interview who may not be the best person to give information 
• There can be defects due to the bias or prejudice of the interview himself, interview is a difficult skill and needs training 
• It is a costly and time-consuming method.