Melaku Girma, PhD Student in Software Engineering Track, Addis Ababa University, Lecturer at School of Information Science, Addis Ababa University. P.o.Box 673 Addis Ababa Ethiopia Tel. +251-911-737249 E-Mail:
[log in to unmask] [log in to unmask] Never tell your problems to anyone...20% don't care and the other 80% are glad you have them. Lou Holtz When one door closes, another opens; but we often look so long and so regretfully upon the closed door that we do not see the one that has opened for us. Alexander Graham Bell