During the project, the full - published and unpublished - body of Janina Hosiasson-Lindenbaum's work was gathered and analyzed. The origins and the development of her early theory of rational degrees of belief were reconstructed from the published work and archive material, putting it all in the social and philosophical context in which it was developed. Archive research was done - in person, online, and with the help of long-distance assistants - in the United States, England, Poland, Lithuania, the Netherlands, and France. The result of that was the fullest reconstruction of Hosiasson-Lindenbaum's professional and private life to date. In particular, the strategies used by Hosiasson-Lindenbaum when trying to escape Lithuanina as a was refugee in 1939-1941 were uncovered and the reasons for their ultimate failure were postulated, based on the available material as well as a study of the wider historical context of these events. An in-depth study was made of the uptake of Hosiasson-Lindenbaums ideas, together with other similar cases in the history of (female) philosophy, leading to the formulation of a framework for researching and writing about the achievements of female philosophers in 20th century analytic philosophy. Hosiasson-Lindenbaum's scientific network was reconstructed based on the archive material, as well as her career strategies. A case study of Hosiasson-Lindenbaum's career was used to inform an original approach to the problem of including women in the history of philosophy.