And Adding Another

It is immensely difficult to understand how children learn one language. The competing descriptions each explain only part of the process, so a complete understanding requires integrating pieces from different perspectives. The need to weave together a larger fabric from distinct fragments is not surprising given the complexity of the enterprise and the number of factors that impinge on children's experience in language learning. This complexity is multiplied when one considers the factors relevant to a child's experience in learning two languages.