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Maintaining good day-to-day asthma control is the key to keeping symptoms at bay and preventing asthma attacks. Using a written asthma action plan makes it easier for you to measure whether your asthma is under control — and it lets you know exactly what steps to take when it isn't. An asthma action plan is especially important if you have moderate to severe asthma or you've had a serious asthma attack in the past. Here's how to get started.