The communication mix is a relevant decision issue for an organization that plans an advertising campaign for a fixed future event. It is assumed that the objectives of the organization are to minimize the cost of the advertising campaign and to drive the final demand as close as possible to a target value. Two different advertising channels are available: the first affects deterministically the consumers' demand, whereas the second presents some stochastic aspects which are out of the decision-maker's control. Some recent mathematical developments on the stochastic linear quadratic control problem allow the formulation and solution of some interesting instances of the problem. A comparative analysis of the efficiency of deterministic and s...