Reading Horizons Discovery helps to teach students in grades K-3rd to read and spell words. I chose to use the unit over S-Blends because has a good overview of what all Reading Horizons Discovery has to offer. I used this curriculum while student teaching and while being a long term sub. 

This unit of Reading Horizons Discovery is supported by the learning theory of social constructivism.

NCTE and ISTE connected to the Reading Horizons Curriculum