Structured interview:
It is a quantitative research method commonly employed in survey research. It aims to ensure that each interview is presented with the same questions in the same order. A structured interview also standardises the order in which questions are asked of survey respondent.
Unstructured Interview:
Where the question can be changed or adapted to meet the respondent's intelligence, understanding or belief. Unlike a structured interview they do not offer a limited, pre-set range of answers for a respondent to choose, but instead, advocate listening to how each person responds to the question. An unstructured interview is a beneficial method for developing an understanding of an as of yet not fully understood or appreciated culture, experience or setting.