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The usual intro to REA focuses on the Exchange pattern:
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![REA exchange pattern](https://upload.wikimedia.org/wikipedia/en/7/7f/ReaExample.png)
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The usual intro to REA focuses on the Exchange pattern, where two Agents trade Resources with each other.
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But there is another REA pattern, which [ValueFlows calls Process](https://valueflo.ws/introduction/processes.html)
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and which might be called Conversion or Transformation in other REA references.
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... | ... | @@ -11,13 +9,15 @@ For example, here is a Process to create a 3D printed part: |
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![process pattern](https://user-images.githubusercontent.com/117439/66481117-cfc68080-ea65-11e9-9a0f-d36052e5395c.png)
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This was a real Sensorica process. The cartoon follows some of the inputs to the process back to where they came from. For example, the 3D Printer was purchased via donations from 15 community members, as you can see in [the "Where From" information on its Resource page](http://nrp.sensorica.co/accounting/resource/411/).
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This was simplified from a real [Sensorica](http://www.sensorica.co/) process. The cartoon follows some of the inputs to the process back to where they came from. For example, the 3D Printer was purchased via donations from 15 community members, as you can see in [the "Where From" information on its Resource page](http://nrp.sensorica.co/accounting/resource/411/).
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The general pattern for a Process is simple:
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* Resource->InputEvent->Process->OutputEvent->Resource
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where each Event has a providing Agent and a receiving Agent.
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Usually the receiver of the output Resources is a group Agent that the providing Agents of the inputs are related to. But in those cases, there are implied claims from the providers of the inputs to the receiver of the outputs. In Sensorica, those claims are handled by [Value Equations](https://speakerdeck.com/mikorizal/10-nrp-value-equation-concepts-and-tutorial) that govern how income gets distributed to contributors to the creation of whatever brought the income.
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Each Event has an Action, which might be:
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* **Use**: the Resource is used by the Process, but after the Process, it is ready for its next Use. The Resource might be affected by the Process, but still exists. The Resource might suffer some wear and tear, or in the case of an agricultural field, might be degraded or even improved in the Process (such as by adding some compost).
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* **Consume**: the Resource goes into the Process and is gone from its previous existence.
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... | ... | @@ -32,4 +32,4 @@ In the cartoon, |
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* but the work that created the design required some special skills
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* the work of operating the 3D Printer required some training and experience.
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Here you can see [this Process in context](https://speakerdeck.com/mikorizal/nrp-round-trip). |
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Here you can see [screenprints from the real Sensorica Process in context](https://speakerdeck.com/mikorizal/nrp-round-trip). |