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In March 2019 the European Commission announced that the EWP standards will be mandatory from the beginning of the new Erasmus Programme in January 2021. The timetable they put forward was: 
    2021: Inter-institutional agreements and Online learning agreements
    2022: NominationsInter-institutional agreements
    2023: Nominations and Transcripts of records

In practice there are 3 ways to do this:
A HEI implements the APIs itself
A HEI uses a third party software tool
A HEI uses the EWP/Erasmus Dashboard

A combination is possible, but you cannot combine tools for the same API service. 

In practice, this means that HEIs can gradually introduce the changes, even though the EWP Network already has operational APIs for all of the processes in student exchanges as we speak. For a detailed description of the EWP APIs click here. Our third-party provider EWP partners (Mobility Online (AT), MoveON (UK), USOS (PL), Cineca (IT), Sigma (ES), FS (No)), have committed to implement all APIs in their business development plan, but the exact timetable is, of course, their own responsibility.  
Finally, the EWP/Erasmus Dashboard will be fully EWP compatible as of May 2020.

You could also start with one solution for a particular API  service and later on change to another one, as long as you don't use two solutions for the same service.