I am interested in references that explain 'introspective research' as a research methodology, but also references of 'design research' in which this method was used.
I would also suggest getting to know the phenomenological approach for a concept of introspection as a scientific research method. You can find introduction how to use phenomenology in design research for example in "The UX Book" by Hartson & Pyla, 2012.
More philosophical explanations on introspection can be found eg. in "Phenomenological research methods" by Moustakas, 1994. Also Chalmers has written about phenomenology as a method to study conscious experiences. In addition Daniel Dennett (2003, Who’s On First - Heterophenomenology Explained) has proposed a extension to the first-person perspective by including third-person perspective (= collaboration with a researcher), which he calls heterophenomenology.
You could have a look at this EU grant which will conclude this year...there are a number of books comming out of it in the next 8 months and a major exhibition in London at Westminster in November....http://adapt-r.eu/. Also these two articles touch on the use of reflection as a researc tool in design practice research and provide a model of knowledge for design practice research that is situated within design itself rather than imposed on it from the direction of other disciplinary codes eg philosophy, theory, feminism, social science etc....the third listed paper deals with that issue directly.
Chapter What if Design Practice Matters?
Chapter Topological Errors in Creative Practice Research: Understand...