# COA phases, contracts and Data Mover roles

A summary of these concepts is shown in the following table:

| COA Phase | Contract Type       | Description                                                                           | Data Mover Role |
| --------- | ------------------- | ------------------------------------------------------------------------------------- | --------------- |
| Input     | Input contract      | Data Mover connects to the Producer's data store to get the files.                    | Client          |
|           | Connection contract | Data Mover receives the files from the Producer.                                      | Server          |
| Mediation | Mediation contract  | Data Mover applies specific actions to files to make them ready for the output phase. | N/A             |
| Output    | Output contract     | Data Mover sends the files to the Consumer's data store.                              | Client          |
|           | Connection contract | Data Mover waits for the Consumer to connect and collect the files.                   | Server          |

 


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