Complete sets, including corresponding student and teacher versions of each book. Topic-based, suited for practical use in the science classroom; Relevant, handpicked topics that students like to talk about most. Scientific, conforms to the standards of the FOSS academic curriculum. Active and lively, tailored to the tastes and interests of American children. Systematically designed, divided into levels according to students cognitive development. Highly educational, acquire Chinese language and gain academic knowledge simultaneously. Practical, interactive activities throughout the entire learning process. Flexible, utilizes a wide range of teaching styles.