This volume contains the papers accepted for presentation at the 15th Wo- ing Conference on Requirements Engineering: Foundation for Software Quality (REFSQ 2009), held in Amsterdam during June 8-9, 2009. Since 1994, when the ?rstREFSQ tookplace, requirementsengineering (RE) has never ceasedto be a dominantfactor in?uencing the quality of software, s- tems and services. Initially started as a workshop, the REFSQ working conf- ence series has now established itself as one of the leading international forums for discussing RE in its many relations to quality. It seeks reports on novel ideas and...