P3T ADASS 2024 - discussion on client impact

[Pierre Fernique]

Hi,

For your thoughts (following the discussion on PT3 at IVOA Malta Interop 
concerning the potential impact of a minor or major breakdown in 
standard compatibility)

To illustrate our difficulty in imposing a client update on the 
community due to an incompatibility with a new version of the data 
servers. Here are the usage statistics for AladinDesktop versions over 
the last 5 years.

And when we look closely at who is still using older versions of Aladin, 
we can find some broad categories such as Aladin embedded in APT, or 
some VO students exploring our collection of VO tutorials.

So I suppose that a large breakdown would have to have a really 
significant benefit to justify such an impact, especially from a 
user/mission/project perspective. And in any case, should be managed 
with a several years compatibility window.

Pierre

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