Between 4 and 5 years children become extremely curious in the world around them. Questions of who, what, when, where and why, are endless. Once children start kindergarten they become more social beings, making friends and enjoying other children's company. Kindergarten also helps children become more responsible, get used to following instructions and capable of working together in small groups. This preschool structure has major ramifications on the learn to swim lesson. Now, children are ready to start learning to swim in small groups with one teacher or parent instructing the group.

Once children start learning to swim as part of a group, it becomes extremely important for them to be placed in swimming classes according to their individual swimming ability. This homogenous grouping of swimmers creates the ideal learn to swim environment and leads to more efficient swimming teaching.