It depends on your topic and qualitative reaseach approach. I would suggest you to read about purposive, convenience and snowball sampling techniques.
As per my experience these all sampling techniques are beneficial for qualitative researchers to recruit participaints. However, I have used two sampling techniques convenience and snowball in my study which helps me in recruiting right sample for my study.
Md . Hasnain Ahamad purposeful sampling is the most used sampling technique in qualitative research, which has several types (e.g., maximum variation, snowball, critical case, theoretical, intensity sampling, etc.). Which technique you will use, will depend on your research question and study population.
Non-probability sampling techniques are the most appropriate for qualitative approaches. The main ones being purposive (judgemental), convenience and snow-balling. The attached chapter proof may assist.
What are known as purposeful (or purposive) sampling techniques are the most commonly used technique in qualitative research. You can search for a list of the purposeful sampling techniques proposed by Michael Patton (his original list included 14 varieties, but his most recent has 40).
In my opinion, for qualitative research I must focus on the social aspect to have real and faithful results, if we refer to modernity. I would go to the field to look for real and oral interviews so that it allows me to carry out the strategy of the scientific methodology in all its parts and be able to obtain updated theoretical models with more viable results.
The guidance/elaborations as per the following publications may further help.
Gentles, S. J., Charles, C., Ploeg, J. and McKibbon, K. A. (2015) Sampling in qualitative research: Insights from an overview of the methods literature, The Qualitative Report, 20, 11, pp. 1772-.
Marshall, M. N. (1996) Sampling for qualitative research, Family Practice, 13, 6, pp. 522-525.
Patton, M. Q. (1990) Purposeful Sampling, in Patton, M.Q. (ed.) Qualitative evaluation and research methods. 2nd ed. Newbury Park, California: Sage Publications, Inc., pp. 169-186.
its depend upon your topic as well as your respondent
if your respondent are literate so you conduct Questioneir based otherwise interview mathod and participant observation method is a very good techique for qualitative data collection
Purposive sampling. You can also go for snowballing if your topic has a small rarely available population. Focus on getting information rich data thru your sample.
Eso depende del objeto de estudio y las intencionalidades de la investigación. Son varias las que el investigador puede utiliza, endependencia de los objetivos de su estudio y las características particulares del objeto. Fundamentalmente la observación participante, la entrevista en profundidad, la historia de vida, dinámicas grupales (brainwirtting, snowball, philip 66, forum comunitarios, grupos de discusión, grupos focales, entre muchas otras).
All of the answers here are excellent. Overall, as noted, it depends on your approach and data collection methods. As an ethnographer, most of what I do is snowball sampling. This website may be of some use to you in sorting this out: https://mmeo.hdo.utexas.edu
Following up on David L Morgan 's suggestion to look into Michael Patton, there are some simplified descriptions you can review as a step in that direction as well, such as http://www.saravaca.com/project/pattons-40-purposeful-sampling-strategies/
An effective sampling technique in qualitative research depends on the nature of the problem under study. A researcher should should use that type of non-probability sampling which fits with the problem. For e.g., If a researcher is doing research on a topic where little information is available, exploratory research design and snowball sampling will best work. Generally, carrying research in a natural setting is very useful in qualitative research
I would suggest a judgemental sampling which is a non probability sampling technique.This is because the in PI we need samples who know about our topics and sometimes we need experts.Thus it is not good to randomly select anyone.Be judgemental and decide who to interview and whi to not.
It depends on your topic and qualitative reaseach approach. I would suggest you to read about purposive, convenience and snowball sampling techniques.
As per my experience these all sampling techniques are beneficial for qualitative researchers to recruit participaints. However, I have used two sampling techniques convenience and snowball in my study which helps me in recruiting right sample for my study.