>>>Hi everybody,
>>>
>>>I've checked this link http://grammarist.com/spelling/cancel/ but I am not 100% sure which spelling should I choose. The software is written by US company, but may be used by US, Canadian, NZ and Australian clients. It may also be used internationally in other countries.
>>>
>>>So, just wondering what spelling do you prefer in your code?
>>>
>>>Thanks in advance.
>>
>>I wouldn't worry much about it. The meaning of the word is well understood by English speakers everywhere, even if there is a slight difference in spelling. Neither is incorrect.
>
>I have another case of, I believe, wrong usage of the word - I am not sure if I need to correct it, though.
>
>Let's consider this text
>
>"The incentive is satisfied if the Group Level (actually lesson level) for the event satisfies the specified criteria."
>
>For each individual criterion we perform a check whether conditions are satisfied or not and then print this kind of the message. To be 100% correct we need to use the word "criterion" here, not "criteria". However, I am not sure if it's worth the trouble of fixing all the code (because this kind of text is repeated over and over again in that class).
>
>What do you think?

"Conditions" is plural, so shouldn't it be "criteria"?