Definitions "from the book"

To what extent do the following definitions of action research concur with or differ from your own definition, or your initial thoughts?

Definition 1:
Action research is simply a form of self-reflective enquiry undertaken by participants in social situations in order to improve the rationality and justice of their own practices, their understanding of these practices, and the situations in which the practices are carried out.
Carr and Kemmis, 1986

Definition 2:
Systematic enquiry designed to yield practical results capable of improving a specific aspect of practice and made public to enable scrutiny and testing.
www.standards.dfes.gov.uk/research/glossary

Definition 3:
Inquiry-based research conducted by teachers that follows a process of examining existing practices, implementing new practices, and evaluating the results, leading to an improvement cycle that benefits both students and teachers. Synonyms include practitioner research, teacher research, site-based research, and action science.
http://cs3.wnmu.edu/elearning/a404/support/a404b0_50100.html (dead link, June 2008)