Thapap, Yeah, you are right, OO features was injected on Perl 5 onward. Though I use linux mostly, but left to use perl after 2001. Well, I am also not bias toward any one set of os, language or tool on my computing career. Just trying to use effective tools, lang to have job done on specific situation. You can read some ruby article online from linux journal mag too - http://www.linuxjournal.com/issue/147 I have posted Software Engineering explained graphics from http://2listnow.com/googleimage/softwareengineeringexplained1r550x413.jpg