Inter-letter, inter word, and line spacing have significant impact on readability for early readers, so I appreciate the extra choices for “normal” “wide” and “extra wide” spacing between letters.
Can you clarify how many letter-spaces there are between words in the normal, wide, and extra wide features? It would be helpful in planning progression.
I am reading that spacing between letters should not exceed more than 10% (ie more than 1.28 x the width of the lowercase x used in the normal Courier text.) I’m presuming that the extra-wide does not exceed that? It looks SO wide to me.