“…By choosing the Manhattan distance, we are using the principle of maximum efficiency in which we focus only in the sum of total performance without considering the balance of solutions. Then, a combined performance (10,2) in mathematical modelling is as good as the (7,5) in project development because the distance to the ideal in terms of the Manhattan distance is the same (8). However, some teachers may be interested in avoiding corner solutions as the mathematical modelling, specially in teaching operations management to lawyers.…”