[ACM Press the 10th European software engineering conference held jointly with 13th ACM SIGSOFT international symposium - Lisbon, Portugal (2005.09.05-2005.09.09)] Proceedings of the 10th European software engineering conference held jointly with 13th ACM SIGSOFT international symposium on Foundations of software engineering - ESEC/FSE-13 - Combining self-reported and automatic data to improve programming effort measurement