In my own opinion, I think what’s different between IA and interaction design is the target user of the organized information will deliver to. IA will make the vast and complex information easier to understand, but it’s still for someone with a professional need. After that comes the interaction designer, further simplifying the information and organizing them so everyone can use and understand it. So IA and the interaction designer can work together as different parts of the factory, IA assembles the toy part, and the Interaction designer packages them to sell.
