Regarding "object oriented" vs "object orientated", the former is the standard variation while the latter is what linguists call a backformation. http://en.wik

Regarding "object oriented" vs "object orientated", the former is the standard variation while the latter is what linguists call a backformation. http://en.wikipedia.org/wiki/Back-formation http://en.wikipedia.org/wiki/Back-formation Basically, someone interprets "orientation" as having a stem of "orientate" analogous to how "contemplation" has a stem of "contemplate". Of course, the real stem is "orient".