The union and employer negotiate with a wage increase. Their behavior is summarized in the claim and offer functions. A sequence of offers and counter-offers determined by the functions above converges to some fixed values of offer and claim. If the former is equal to the latter, they can settle on a new wage level. Otherwise, the union goes on a strike. After several strikes, they reach a mutually satisfactory agreement. The model also shows that the offers are increasing and the claims decreasing during the bargaining process.