It depends on the situation....if I am fishing new water and/or an area I have not patterned the fish, then multiple flies help me locate and pattern the fish. In ponds I am familiar with, I rarely use multiple flies because I know what works and I use it. The only multiple rig I will use is the trailing fly behind a Miss Prissy or other top water fly. Other rigs/flies invite far too many tangles to make it worthwhile.