People make a thousands of judgments and decisions every day, such as deciding which meal to eat for lunch or judging how much one likes a new acquaintance. To make these judgments, people need to combine and integrate several pieces of information, such as the price of the meal or its visual appeal, into a global evaluation. My research aims to undercover the cognitive underpinnings of these inference processes. In doing so, I draw upon key insights from memory and learning research and incorporate those insights into psychologically informed theories of human judgment that provide testable, quantitative predictions. I apply this knowledge to understand how we can improve treatment decisions of Multiple Sclerosis Patients, social judgments and evaluations, and advice taking from Artificial Intelligence.