1. Software Engineering Department, Azrieli – College of Engineering, Jerusalem, Israel. E-mail: rbz@jce.ac.il
2. Industrial Engineering & Management Department, Ariel University, Ariel, Israel. E-mail: talgr@ariel.ac.il
3. Computer Science Department, Ben-Gurion University of the Negev, Beer-Sheva, Israel. E-mails: elena.chk@gmail.com, ehud@cs.bgu.ac.il