Constructivist grounded theory (CGT) is a qualitative research methodology in which new theories are actively co-constructed by the participants and the researcher.

"Grounded theory (GT) is a research method concerned with the generation of theory, which is ‘grounded’ in data that has been systematically collected and analysed. It is used to uncover such things as social relationships and behaviours of groups, known as social processes....It is a general methodology for developing theory that is grounded in data which is systematically gathered and analysed."