John Kruth in a recent article in the Journal of Parapsychology breaks down five different approaches to scientifically analyzing research. These include narrative, case studies, phenomenology, grounded theory and ethnographic studies. Kruth also explores transpersonal research perspectives. Qualitative research is a method for providing reliable information on a case-by-case basis. Quantitative research is the mathematical analysis common to science. Kruth makes a claim that the laboratory is sometimes not the best environment to study either PSI or paranormal phenomena.
Kruth makes the claim that some types of paranormal experiences are too complex or obscure in order to accurately study them in the laboratory. In some cases qualitative research, again, which are case studies, many times provide a voice and meaning to the phenomena being studied. Kruth makes an important statement about not only proving paranormal phenomena via mathematics and laboratory methods, but also by examining the context and meaning that humans have with these events.
Kruth, J. G. (2015). Five qualitative research approaches and their applications in parapsychology. Journal of Parapsychology, 79, 219- 233.