Issue 18044: Location: 18.1.1 Summary P. 685 - A Subject may only refer to a single system (uml25-ftf)
Source: Soluta.net (Dr. Adriano Comai, acomai(at)soluta.net)
Nature: Clarification
Severity: Minor
Summary: current text: “A UseCase’s subject represents the system or systems under consideration to which the UseCase applies.”

[AC] This addition wasn't in the previous UML version, 11-08-06, where the description was “The subject is the system under consideration to which the use cases apply.”

I consider the plural “or systems” ambiguous, because it lets the reader think that the subject may refer to more than a single system. 
If we want to say that the subject may be a very complex one, such as a system of systems (and this may be indeed useful in my opinion) we should state this point explicitly.

So I suggest to go back to the previous formulation, or to state more explicitly that the subject may refer to an arbitrarily complex system

Resolution: 
Revised Text: 
Actions taken:
September 28, 2012: received issue
Discussion: 
Perhaps the current text was trying to get at the fact that a UseCase may have more than one subject, each one representing a system to which the UseCase applies
End of Annotations:=====
s is issue # 18044

Problem: 18.003

Severity: Minor
Type: Clarification
Location: 18.1.1 Summary               P. 685
Title: A Subject may only refer to a single system
 
Description:
current text: .A UseCase.s subject represents the system or systems under consideration to which the UseCase applies..
 
[AC] This addition wasn't in the previous UML version, 11-08-06, where the description was .The subject is the system under consideration to which the use cases apply..
 
I consider the plural .or systems. ambiguous, because it lets the reader think that the subject may refer to more than a single system. 
If we want to say that the subject may be a very complex one, such as a system of systems (and this may be indeed useful in my opinion) we should state this point explicitly.
 
So I suggest to go back to the previous formulation, or to state more explicitly that the subject may refer to an arbitrarily complex system.
 
Source: Adriano Comai
 
Discussion: 
Perhaps the current text was trying to get at the fact that a UseCase may have more than one subject, each one representing a system to which the UseCase applies
 
Michael Jesse Chonoles