%A S. Huck %A H.-T. Normann %A J. Oechssler %K Cooperation, prisoners' dilemma, adaptive dynamics %X We introduce a simple adaptive rule where agents choose a cooperative effort on a grid. Agents can adjust this effort step by step and Gains and Losses Adjust Directions. We show that this process con- verges to the cooperative outcome in a two-person Prisoners' Dilemma game, and we provide simulations showing that the results also holds with a larger number of agents. %N 83 %S ELSE Working Papers %C London, UK %D 2004 %L discovery14591 %I ESRC Centre for Economic Learning and Social Evolution %T GLAD: a simple adaptive strategy that yields cooperation in dilemma games