The DLM Early Childhood Express is a holistic, child-centered program that nurtures each child by offering focused, meaningful instruction that is developmentally appropriate. Teacher's Editions - Each of the 8 Teacher's Editions focuses on a specific theme and contains explicit, systematic instructions. There is one bilingual book for each four-week theme, providing essential questions for each lesson as well as plans for centers and suggestions for classroom management. This Teacher's Edition's theme is Let's Investigate.