AI is the most important part of the project and the core of the game.
Customers are by far the most complex AI on the game and the ones that will put the challenge to the player.
They will enter the restaurant and look for a queue, then, once they have their food, they will walk to a table and sit there to eat before leaving the place and giving or substracting renoun depending on their happiness.
So, how can you make them be happy? there are several things that affect that. Time they have to wait on queues, quality and speed of your workers, cleaningless of the restaurant, ... Yet some of them will be more exigent than others so, sometimtes, there is nothing you can do. But don't worry, these ones will only appear on the latest stages of the game!
Workers are your main force in the restaurant. They are your hands and will help you get to your goals. They can be hired and changed each day, but take on account they will want to be paid, so be wise and take the better decisions to ensure you do not end in bankruptcy!
Kitchen workers will cook the food and deliver them to the queueing customers. Their speed is key for their work!
Cleaners will go to the trash left by the customers and clean it to ensure the restaurant's cleaningless. Actually you can run the restaurant without them but they are important: each trash left will make customers unhappy!