The usage as 'user(s)', is it correct?
Often see this usage, for example:
"The user(s) and the customer(s) are often not the same person(s)." (IEEE Std 830-1998)
It seems, I think, this usage such as 'user(s)' has a logic error: confused a set (collection) and its members. My reason is that a set can have a 0, 1, ..., n of members, so we should always use the plural when we talking about the set, isn't it?