Chapter 7 scrutinizes how Congress’s internal resources impact the quantity and quality of information received by committees. Amid concerns over diminishing congressional capacity and the waning role of support agencies, the chapter explores the repercussions of downsizing initiatives – such as the elimination of the Office of Technology Assessment (OTA) – on committee information channels. Employing a difference-in-differences research design, the study reveals a stark decline in technical and scientific witnesses invited by committees heavily reliant on internally produced information post-OTA elimination. The findings underscore the critical role of robust congressional capacity in summoning research-based witnesses, emphasizing its pivotal significance in ensuring legislators’ access to vital scientific and technical insights.