Maria S. Loose, LL.M. wrote:
How do you prove your translation experience other than by POs, contracts, letters of reference etc?
A PO does not prove any translation experience. A PO proves only the fact that some agency has ordered something to some individual claiming to be a freelancer (for example), but it does not prove that the individual has ever completed the task at all.
If the recipient of these documents is not a translation agency but a public institution whose employees are bound by professional secret not to divulge this kind of information, I think it's safe to submit these documents.
In my example it is not. It is just a translation company, one of thousands.