Your next step depends on a reply, a document or permission from someone else. The whole project stays on the list as something you should be doing, even though you cannot complete the blocked part today.
Write down exactly what you are waiting for and who can provide it. Send a clear request with the date that matters. Decide when to follow up, considering any response arrangement already in place.
Look for useful independent work
Check whether another part can move without the answer. You may be able to gather your own documents or draft a question. Avoid doing work that will probably be discarded if the missing decision goes another way.
If no useful independent step exists, mark the project as waiting and move it out of today's active tasks. Keep the follow-up date visible so it does not disappear. When the answer arrives, revise the plan using the actual information rather than automatically continuing the assumptions you wrote while you were waiting.
