Shack: What is the Notoriety system, and how does it work?

Rasmus: When you perform your deeds on the mission, and people and cameras see you do this, you will be reported etc. to the papers. This will make NPC's know you, so when you play the next missions, there's a higher risk you might be recognized even before you do anything.

So a good thing is to remove witnesses, destroy security cameras and the tapes to not get too notorious. If it happens though, and the going gets too tough, you can use bribe or even purchase a new identity to make your life easier again. This is not cheap though!

Shack: How do players keep track of their Notoriety (or lack thereof)?

Rasmus: When you finish a mission a graph in the debriefing will show you your current notoriety level, and when you play a new level it's noted in the mission briefing what your notoriety level is (also if you jump backwards and replay a previous mission).

Shack: Let's say I choose to go absolutely gun crazy during a certain level. How can I prevent dozens of citizens (and targets) from recognizing me in successive missions?

Rasmus: By killing them! The more violent you play, the more you would probably need to take care of business. Violence breeds violence in Blood Money.