Crusader, I think that Columbus said to book part profits at each line crossover. Somewhere in this thread you will find a post which spells out 25%, 50% and 75% and 100% levels. In case of a buy (i.e. lower BB(20,2) pierced), the levels are 25% = lower BB(20,1) pierced, 50% = EMA20 pierced, 75%=upper BB(20,1) pierced, 100% = upper BB(20,2) pierced. The reverse for sell.