Women in doctoral programs in Science, Technology, Engineering and Math (STEM) leave without finishing at higher rates than men and, as with men, turn away from academic and research careers. This qualitative study examines the day-to-day influences on female doctoral students during their third or fourth year in physical science and engineering programs. Ethnographic cognitive interviewing and online incident reports document the specific experiences and reactions of 28 participants over a six-month period. The data were analyzed to identify key incidents, categories and recurring themes. Some incidents contributed to women's growing sense of competence, recognition and identification of oneself as a scientist. Others fit a model of microaggressions and gender barriers in a predominantly masculine culture. Problems of work-life balance were demonstrated for some women. Incidents generated responses by some participants that they would disengage from a research-intensive career trajectory toward alternate career interests outside of academic research. The findings provide information about the lived experiences of women in doctoral programs and suggest that the metaphor of career pathways may be more useful than pipelines in explaining the direction of women who are advanced doctoral students in research-intensive fields.Keywords: women; graduate students; science and engineering; STEM; gender inequity Gaps between men and women persist in the pursuit and outcomes of degrees in science, technology, engineering, and math (STEM) (Shauman 2017; Turk-Bicakci and Berger 2014). In the life and social sciences, women have closed the gap in undergraduate majors and admission to graduate programs and now exceed men in completion of doctoral programs (National Science Foundation 2017). Yet women are awarded fewer than 25% of the doctoral degrees in the physical sciences and engineering, and hold disproportionately fewer tenured faculty positions in STEM and far fewer positions of prestige and power (Bernstein 2011;Handelsman et al. 2005;Fox 2001; National Science Foundation 2017).The "leaky pipeline" metaphor commonly refers to the disproportionate exit of women from STEM at transitions from one educational or career level to another, the consequence of which is fewer and fewer women remaining in the "pool" for subsequent advancement in STEM ). The pipeline metaphor relies on a somewhat linear conception of careers with certain specified outcomes, such as moving from an undergraduate major in STEM, through PhD degrees and postdocs, to faculty positions, to tenure, and eventually to full rank in research universities. Previous research on why women leave STEM fields at a greater rate than their male counterparts has examined the motivation of women to pursue STEM undergraduate degrees (Beyer 2014;Griffith 2010;Grunert and Bobnerb 2011;London et al.