Grounded theory is a systematic methodology that has been largely applied to qualitative research conducted by social scientists. The methodology involves the construction of hypotheses and theories through the analysis of data and inductive reasoning.
Background
Grounded theory is a general research methodology, a way of thinking about and conceptualizing data. It is used in studies of diverse populations from areas like remarriage after divorce and professional socialization. Grounded theory methods were developed by two sociologists, Barney Glaser and Anselm Strauss.
A turning point in the acceptance of the theory came after the publication of Awareness of Dying. Their work on dying helped establish the influence of grounded theory in medical sociology, psychology, and psychiatry.
Philosophical underpinnings
Grounded theory combines traditions in positivist philosophy, general sociology, and, particularly, the symbolic interactionist branch of sociology. According to Ralph, Birks and Chapman, grounded theory is "methodologically dynamic" in the sense that, rather than being a complete methodology, grounded theory provides a means of constructing methods to better understand situations humans find themselves in.
Glaser had a background in positivism, which helped him develop a system of labeling for the purpose of coding study participants' qualitative responses. He recognized the importance of systematic analysis for qualitative research. He thus helped ensure that grounded theory require the generation of codes, categories, and properties.
Strauss had a background in symbolic interactionism, a theory that aims to understand how people interact with each other in creating symbolic worlds and how an individual's symbolic world helps to shape a person's behavior. He viewed individuals as "active" participants in forming their own understanding of the world. Strauss underlined the richness of qualitative research in shedding light on social processes and the complexity of social life.
Grounded theory constructs symbolic codes based on categories emerging from recorded qualitative data. The idea is to allow grounded theory methods to help us better understand the phenomenal world of individuals.
A goal of the researcher employing grounded theory methods is that of generating concepts that explain the way people resolve their central concerns regardless of time and place. These concepts organize the ground-level data. The concepts become the building blocks of hypotheses. The hypotheses become the constituents of a theory.
In most behavioral research endeavors, persons or patients are units of analysis, whereas in grounded theory the unit of analysis is the incident.
Most researchers oriented toward grounded theory do not apply statistical methods to the qualitative data they collect. The results of grounded theory research are not reported in terms of statistically significant findings although there may be probability statements about the relationship between concepts. Internal validity in its traditional research sense is not an issue in grounded theory. Rather, questions of fit, relevance, workability, and modifiability are more important in grounded theory. Grounded theory adherents are "less charitable when discussing [psychometric] reliability, calling a single method of observation continually yielding an unvarying measurement a quixotic reliability."
The idea that all is data is a fundamental property of grounded theory. The idea means that everything that the researcher encounters when studying a certain area is data, including not only interviews or observations but anything that helps the researcher generate concepts for the emerging theory. According to Ralph, Birks, and Chapman field notes can come from informal interviews, lectures, seminars, expert group meetings, newspaper articles, Internet mail lists, even television shows, conversations with friends etc.
Coding
Coding places incidents into categories and then creates one or more hierarchies out of these categories in terms of categories and subcategories or properties of a categories. A property might be on a continuum such as from low to high, this may be referred to as a dimension. Constant comparison where categories are continually compared to one another is used to create both subcategories and properties.