Undercueing, Overcueing, what to choose and why, how should it look, what's to avoid... it's more or less an open thread, within its general topic. As a suggestion I'd like to ask, though, to make ample use of concrete examples, instead of having an abstract conversation.
For starters, I'd like to throw in the most unorthodox cue (not the most interesting one, though) I have yet placed. Imagine two movements, the second one following attacca out of the first. We have an instrument that does not play in the first movement (and is not even listed in that movement's first score system) but which has to confidently play at the very beginning of the second movement. After discussing this with several orchestra musicians, it turns out that there is a potential need to have a cue at the end of a tacet movement, even though I have never seen this anywhere else before. This is what I ended up with:
