The Project Manager should always be looking for RICs (Risks, Issues, and Change Requests). Whenever you find out about a new RIC, it will be captured in your Journal (e.g. a mobile application). It’s important to write it down immediately, otherwise you may forget it, and nevertheless, it consumes your mental energy to try to remember them.

Then, whenever you’re behind your desk, you will review the Journal, and move the important items to the RIC Register. Those that are too simple can be left in your Journal until you close them.

Note: using the GTD method is a good idea for this purpose.