What kinds of assumptions interfere with critical thinking?

Assumptions interfere with our critical thinking by causing a mind set about the situation or subject we have heard or experienced. It is an intellectual act by which one concludes that something is true in light of something else's being true, or seeming to be true. Assumptions interfere with conclusions to the issues or situations. All too often something that is openly apparent to one may not be openly apparent to another and therefore creating assumption that does not represent clarity.