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73

answers:

3

In an automated black box trading application who should be identified as the primary actor in the use cases? Is it the system itself or the system administrator or the organization who has a vested interested in the system?

+2  A: 

A system can be identified as such. According to Wikipedia

An actor in the Unified Modeling Language (UML) "specifies a role played by a user or any other system that interacts with the subject."

Justin Ethier
+1  A: 

Your actor will be any system using your black box trading application.

Gabriel Mongeon
A: 

An actor is external to the system and interact with it; the organization is not an actor per se it is a stakeholder.

In this case the primary actor would be the stock market which send quotes to the automated trading system.

Rebol Tutorial
This is the answer we came up with. The system responds to quote event from the market. It also responds to messages from the market (order fills, cancelation reports, etc...).
Behrooz Karjooravary
I'm also interested in trading you know ;)
Rebol Tutorial