I was asked by several people to provide an example use case that fits my template. Here's a simple one, not related to workflow: -Title: Resource Barter Services -Description Allow metrics to define and decide how and when can resource consumers trade or exchange resources already paid for or reserved for themselves. Create an exchange mechanism inside a data center between multiple consumer groups. Use metric to evaluate when it is profitable to use versus it is profitable to rent back. -Actors/Stakeholders · IT Resource Consumers · IT operations DBA · IT operations security geek -Assumptions Choose a small set of hardware metrics that can be agreed to and agree on the cost of each. This is a suggested starting point: · CPU (via some published/rated amount of gridbux/CPU seconds · Memory occupancy (megabyte seconds?) · disk I/O (bytes read/written) · Network (bytes read/written) · Session occupancy (do we charge for idle time?) A depreciation schedule has been established for every resource in the data center. A real-dollar budget has been established for the data center. Users are subject to a published fixed + variable pricing structure over a period of time (e.g., a month). Some mechanism exists for estimating the cost of a job. -Preconditions -Postconditions -Main flow of events User A wishes to complete a job J with estimate C, which is more than A’s fixed budget for the month. User B has fixed budget left over for the month. B advertises remaining fixed budget at a discount. A subleases B’s resources for the duration of job J. A is charged the discounted fee, which is applied to B’s costs for next month. -Issues A strictly pay-as-you go price model doesn’t provide any incentive to rent back. This simplistic example doesn’t really explain why a data center would be interested in allowing this. A customer may need to be able to rent the resources/budget from several providers to complete a single job. What happens if A exceeds the terms of the sublease? -Sources/references -OGF sponsor/stakeholder/interested party You can find many more use cases of this style in the EGA Reference Model documents, at http://gridalliance.org/en/workgroups/techdownloads_download.asp (and, eventually, coming to an OGF website near you).