The explosion of the mobile telecommunications market has resulted in the apparition of multiple applications and services. However the particular business pressure has often lead to that these systems have poor quality design and, consequently, implementation. Software system builders have realized the importance of the overall system organization to address quality requirements. Practically, they started to use, idiomatically, a number of commonly recognized solutions to guide their design of system structures. This report analyses and evaluates these solutions and comments on the result obtained when one of them was carefully selected and applied to a system of mobile positioning services.