The mat study: global insight into the medication administration process.

A screen-phone, notably a radiotelephone, provides a display of a plurality of available functions in the form of a tree menu wherein the user can signify his selections. In order to improve the user's efficiency in handling such a menu, the screen-phone includes modeling means for modeling the user's behavior in making menu selections, including his rate of choosing each particular function as weighted by the number of returns made due to his level of inexperience with such functions. The processing calculations are performed using fuzzy logic. The menu tree is then rearranged to more closely correspond with the user's behavioral model.