The evaluation criteria and procedure are virtually the same as well.
The GMAC reports that the human and the computer differ in a relatively small number of cases, so it's not something to lie awake worrying about. It can measure the quality of your vocabulary (as well as relevance to the topic), as well as proper use of transition key words, such as "however." I can't imagine it recognizes the great ideas you put in your essay, but it does seem to pick up on the rest. Part of the reason the AWA is included on the GMAT is because some applicants might try to cheat.
Plagiarized or ghost-written essays are a problem at every level of admissions, so if the person evaluating your application essays can also see how you wrote during the GMAT, they might notice if there's a big difference. In the back of The GMAT Official Guide, there is a list of all possible essay prompts.
You can also pick up pointers regarding - how to write a good composition - from these articles. So, check out the sample prompts and sample essays on our website and start practicing right now!
The Analytical Writing Assessment (AWA) is how business schools evaluate your writing skills with one 30 minue section essay.