You can easily use completely different Coding-Systems for a single study:
 | You can open other Codes at the start of a new pass through the video and start coding in an existing data file. |
| You can merge files that were coded with completely different Codes and Classes when the observers are finished coding. |
In both cases, INTERACT automatically adds the Class-columns that are missing to the resulting data file. Enabling you to analyze all data as it were coded in one session.
In case you merge files that contain identical intervals, you can even merge these intervals with a single command, as described in Consolidate Identical Intervals.