**Classification tags**: Cellular Automata model, fixed-increment time progression.

The *Gossip Model* is a Cellular Automata model, using the concept of N/E/S/W-neighbourhood
(also called *von Neumann neighbourhood*) where a grid cell has 4 neighbours.

An integer grid has been chosen as the space model. Grid cells have either the value 0, representing a cell that has not yet received the gossip, or the value 1, representing a cell that has received the gossip.

The model is based on two rules:

- If the cell is in state 0, and it has one or more neighbours in state 1, then for each of them, change the cell's state to 1 with some probability, otherwise leave it at 0.
- If the cell is in state 1, it remains in that state.