ETDS and ETAS
 

Anyone have the correct definition of these?

How about estimated time of departure and arrival?

Ergodic Theory and Dynamical Solutions
European Tournament for Dancing Students

...hey, TP! That's only one of them! Do the job properly.

Apologies!
English Teachers Association of Switzerland.....

Thanks dim and dummer.
If you actually paid attention its a capital S.

Thats the one i am interested in.

I spotted that big S, realised Better On A Camel had got it wrong... only trying to help.
What's the context? OFP, CFP, management-speak? Better still give us a sentence with the abbreviations therein.

TP - if not TLAs they must be FLAs. We do love cryptic puzzles.