The 90-minute S&P Alternation Cycle rarely sets up perfectly in the real world. Atmel develops a rhythmic buy-sell swing that persists for well over a day. But examination suggests that the cycle phase is closer to 1-hour than 90-minutes. Stay flexible and use cross-market tools to realign trade setups as required. The last 2 hours of the ATML chart also illustrate that intraday cycles shift timing when markets move from rangebound into trending periods. Keep one eye on the evolving pattern at all times while looking at short-term cycles.