This report summarizes the discussions and conclusions of the Working Group on Beam‐Beam Effects during the Workshop on Beam Dynamics Issues of High‐Luminosity Asymmetric Collider Rings, held at the Lawrence Berkeley Laboratory, Berkeley CA, USA, from 12 to 16 February 1990. The discussions were organized around four topics: (i) The relative advantages of round beams compared to flat beams, (ii) Energy transparency which deals with the question of which beam parameters have to be made equal although the beam energies are different in the two rings, (iii) The simulation of the beam‐beam effect, (iv) Experiments in existinge+e−colliders to check the design concepts for future asymmetric colliders. The overall conclusions arrived at by the working group can be found at the end.