In order to fulfil ecological validity, an interview should follow some of the following features:
a. make the interview situation familiar/comfortable for the interviewee;
b. conduct the interview in his/her space;
c. act like a real person, not as a researcher;
d. do not consult a written list of questions;
e. try to approximate ordinary conversation;
f. show interest;
g. let the interviewee show/tell you what is important and then ask him/her about that.
An open-ended interview is a poweful tool to give a fuller picture of the participants’ everyday linguistic and cultures practices (Briggs, 1986) where the self-making is constructed and performed meaningfully.
Briggs, C. (1986). Learning how to ask: A sociolinguistic appraisal of the role of the interview in social science research.