Your discussion of alternate forms reliability was very thorough and correctly pointed out that the two forms of the text need to be equal in difficulty, as well as length and scope of the material being tested. Nizeli mentioned in her post above that developing alternate forms is a very expensive undertaking, due to the construction of two separate but equal instruments and extensive testing that must be undertaking to demonstrate that both forms of the test are, in fact, equal in measurement.

1. Could you please also address interrater reliability?
Use the author of one of your sources

Kline, T. (2005). Psychological testing: A practical approach to design and evaluation. Thousand Oaks, CA: Sage Publications.
Chapter 7