Sorry!

    Assimilation & Accommodation are the two complementary processes of Adaptation described by Piaget, through which awareness of the outside world is internalised. Although one may predominate at any one moment, they are inseparable & exist in a dialectical relationship.
 
    In Assimilation, what is perceived in the outside world is incorporated into the internal world, without changing the structure of that internal world, but potentially at the cost of "squeezing" the external perceptions to fit — hence pigeon-holing & stereotyping.
 
    If you are familiar with databases, you can think of it this way: your mind has its database already built, with its fields and categories already defined. If it comes across new information which fits into those fields, it can assimilate it without any trouble.