I worked this week with the Navigation Meshes in Unity. With NavMesh it is possible to get quickly a very decent AI for in our game the NPCs of the game. I added a script in which the assigned NavMesh Agent has several states like aggressive, escaping or passive. In the Passive state the agent can be assigned to some Gameobjects with Colliders and he will follow this Path, to mimic in the future game for example the office life.
You're Fired! 