Normative expectation: investigative journalists are watchdog on democratic governance. Therefore, explanations of how stories begin, how they relate to key sources, and what qualities make substantive outcomes more likely are key to understanding and promoting the profession. Previous studies relied on analysis of published stories, which misses key aspects of reporting process (tips, dead-ends, background sources, history with sources). How do journalists and sources work together to build the news agenda? Most agenda building studies focus on PR info subsidies & few link building of media agenda to policy implications.