10. The system recited in claim 3 , wherein the letter in the acceptable letter-phoneme correspondence comprises one of a plurality of letters substitutable for each other, and wherein the substitutable letters comprise backwards letters, silent letters at an end of the word, a single representation of a double letter, a consonant in a common voiced/voiceless pair, and one of a predetermined set of letters having a common characteristic.
3. The system recited in claim 2 , wherein the scoring means comprises a code segment in the software comprising a set of rules for calculating a score for each attempt.