Possible Duplicate:
“s” vs. “z” in BE vs. AE
Are the endings “-zation” and “-sation” interchangeable?
I was asked on a translation assignment to use UK English but with -ize spelling.
What is the more widely used spelling in use in UK English?
What is the more correct form of using it: -ize or -ise?
You might like this link: http://en.wikipedia.org/wiki/American_and_British_English_spelling_differences#-ise.2C_-ize_.28-isation.2C_-ization.29