Milestones and Archiving in ZP3

Milestones and Archiving in ZP3

Prasanna can you please explain again?  How do these differ:  open versus completed/closed versus archived?  As to visibility, searchability, modifiability.

I don't see a pattern.  For example, when I mark a task as completed, sometimes it shows up within the show all status tasks filter; sometimes it does not.  More predictably, it seems always possible to find things via search.  What is the difference between completed and closed; if they are the same shouldn't you use one term consistently?

(Maybe it's something like this:  open tasks will show up on default tasks filter; closed tasks will or should show up upon changing the filter to all (or closed) status; archived tasks will show up only via search (and deleted will not show up by any means).  I hope you can explain it better.