“orthography: The formal name for spelling–the system for representing spoken language in written form. The spelling of English can be difficult to learn due to so many irregular spelling patterns. For example, ‘do,’ ‘due,’ and ‘dew’ are all pronounced the same way. English has 44 sounds, but it has only 26 letters.
The letter-sound correspondence is essential for reading, as is the sound-letter correspondence for correct spelling. Difficulties in these relationships can result in language disabilities.”
Excerpted from: Turkington, Carol, and Joseph R. Harris, PhD. The Encyclopedia of Learning Disabilities. New York: Facts on File, 2006.