IAW (Implementing Aruba WLAN) was the training that prepared for the ACMA (Aruba Certified Mobility Associate) certification.
The IAW has recently be replaced by the Aruba Mobility Fundamentals training, which now includes both Aruba wired and wireless.
To find out what are the current prerequisites (certification) and recommended training, it is best to refer to the datasheets as linked in the response above.