l Details on __ and __ are discussed in later sections. l In the next section, after a statement of the basic problem, various sit uations involving possibility knowledge are investigated: first, an entirely p ossibility model is proposed; then the cases of a fuzzy service time with stoc hastic arrivals and non‑fuzzy service rule is studied; lastly, fuzzy ser vice rule are considered.

l Details on __ and __ are discussed in later sections. l In the next section, after a statement of the basic problem, various sit uations involving possibility knowledge are investigated: first, an entirely p ossibility model is proposed; then the cases of a fuzzy service time with stoc hastic arrivals and non‑fuzzy service rule is studied; lastly, fuzzy ser vice rule are considered.