Final answer:
Jane Addams' epistemology was rooted in pragmatism and the application of science to social reform, reflected in her work with Hull House and her advocacy, which led to her Nobel Peace Prize.
Step-by-step explanation:
The two main epistemological principles in Jane Addams' thinking were pragmatism and applied science in social reform. Addams was deeply influenced by the pragmatist philosophy, which posits that ideas must be tested through practical application to be validated. Her work at Hull House reflected this principle, as she used the settlement house as a laboratory for social change, testing ideas in real-world contexts. The other principle was the scientific approach to societal problems, evident in the way she systematically addressed issues like child labor, healthcare, and immigrant welfare. The Chicago School of Sociology and thinkers like John Dewey, who emphasized the empirical study of social issues, also shaped her methodology. In addition to Hull House, Jane Addams' advocacy for peace and social justice, earning her the Nobel Peace Prize in 1931, exemplifies her commitment to applying epistemological principles for public good.