Psychology graduate students have been worried for several years as questions have circulated about the internship imbalance between the number of students seeking internships and the number of available internships. This project examined the issue of supply of and demand for internship slots at sites accredited by the American Psychological Association (APA). Data were provided by 99% (437 of 442) of the internship sites and 85% (245 of 289) of the APA-accredited professional psychology doctoral programs. Results confirmed speculations about the internship imbalance, or the bottleneck effect. Cumulative effects of the deficits are expected.