derivative classes discovered clewlow strickland least two books implementing derivative models exotic options gather exotic options one intend use class correct way queried participants class heard case study approach occaisionally used appreciated several var class taught jorian book exercises assumes particular background finance statistics created problem exactly case study required participant learn statistics try different approaches participants got better idea one bothers certain issues liked real world flavor kind approach without case approach could provide good counterexampes partial remedy best regards season greetings michael