RT Journal Article SR Electronic T1 The Program Science initiative: improving the planning, implementation and evaluation of HIV/STI prevention programs JF Sexually Transmitted Infections JO Sex Transm Infect FD BMJ Publishing Group Ltd SP 157 OP 159 DO 10.1136/sextrans-2011-050389 VO 88 IS 3 A1 Sevgi O Aral A1 James F Blanchard YR 2012 UL http://sti.bmj.com/content/88/3/157.abstract AB In this article, the authors describe the Program Science initiative in detail, discuss some of its recent accomplishments and explore its significance and timeliness in light of the HIV prevention challenges. The authors also describe the Program Science series being launched and present a preview of future articles.