4th Workshop on Approaches and Applications of Inductive Programming, AAIP 2011 *The deadline for paper submissions has been extended to April 24, 2011.* More information on AAIP 2011: http://www.cogsys.wiai.uni-bamberg.de/aaip11/ -- Dr. Emanuel Kitzelmann International Computer Science Institute (ICSI) 1947 Center Street, Suite 600 Berkeley, CA 94704, USA e-mail: emanuel@icsi.berkeley.edu phone: +1 510 666 2883