“…Most important, none of these assessments account for what research has said about how letters differ from one another in their difficulty (Bowles et al., ; Huang & Invernizzi, ; Justice et al, ; McBride‐Chang, ). As summarized in Figure , some letters are easier: - Letters at the beginning of the alphabet (e.g., A , B , C )
- Letters that appear more frequently in print (e.g., E , S )
- Letters that include their sounds in their names (e.g., B , F )
- Uppercase letters
…”