I have a hard time determining when to use "annex" and when to use "appendix" for information added at the end of a document. I have checked the respective definitions in a number of dictionaries, and I have also googled the difference between the two, but I still find it hard to draw the line sometimes. The following are examples of situations where I find it hard to know which one to use:
John has a year's probationary employment at a company. Added to his employment contract, there is a document in which his boss writes a short progress report at four months, eight months and at the end of the probationary period. Is this document an annex or an appendix to the employment contract?
A company has an operational plan. Added to this plan are a number of excerpts from different policy documents and laws (one document for each excerpt). Are these documents annexes or appendices to the operational plan?
A school has a document detailing procedures for taking in exchange students. Added to this document is a checklist for processing applications and a welcome letter template. Are these annexes or appendices to the procedures document?
I'd be very grateful for any help I could get here...