The way you structure your center/program will help guide this decision; for example, if you group children together by age/developmental level versus group all children together in one classroom.
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While Experience Curriculum is not age-based, ages will help guide the decision making and our recommendations. In general, we recommend the following curricula for the following classroom/age ranges:

It's also important to consider that a broad range of skills are comprehensively covered and integrated into each program in developmentally appropriate ways. There is overlap between programs to support a smooth transition from one program to the next.