Essentials introduces all of the advanced phonograms we teach, but not until students are using the Level C spelling lists. Students using Levels A and B spelling lists in Essentials learn all 75 basic phonograms and several of the more common advanced phonograms.
Foundations teaches students the 75 basic phonograms in levels A - C. Foundations D introduces several of the most common advanced phonograms.
Why is this? In both programs, the focus is on teaching students how words are built and how to ask good questions about words. Once students have mastered the Basic Phonograms, which are what they need to decode about 98% of English words, the curriculum begins to introduce some Advanced Phonograms and the concept of other combinations of letters working together as phonograms. With this knowledge students are prepared to recognize the possibility of an advanced phonogram when they encounter one in a word and to make educated guesses about how it is functioning.