To ensure they're meeting state early learning guidelines for science, preschool educators need fun, age-appropriate, and research-based ways to teach young children about scientific concepts. The basis for the PBS KIDS show "Sid the Science Kid," this teaching resource helps children ages 3-5 investigate their everyday world and develop the basics of scientific thinking--skills they'll apply across subject areas when they enter school. PrePS is: (1) based on the domain-specific approach to cognitive development; (2) provides age-appropriate introduction to key science practices; (3) supports a range of cognitive and social skills; (4) makes the most of children's natural curiosity; (5) encourages collaboration between teachers and children; (6) enhances any curriculum; and (7) taps teachers' creativity. This reader-friendly guide gives educators the guidance they need to work PrePS into their existing program; sample schedules designed for the preschool classroom; and detailed sample activities they can do right away or use as templates for their own creative lessons. With the book's assessment guidelines, teachers will know PrePS is having a measurable effect on the classroom environment and student learning. Included are figures, tables, boxes, references, and activities. The table of contents also includes the following chapters: (1) Introduction to PrePS[TM]; (2) The Nature and Development of Concepts: Implications for Teaching Preschool Science; (3) Key Science Practices; (4) Getting Started and Moving Forward; and (5) Assessment.