Toward an Understanding of Individual Decision Making Under Uncertainty.- I.- The ‘Base-Rate Fallacy’ — Heuristics and/or the Modeling of Judgmental Biases by Information Weights.- A Conceptualization of the Multitude of Strategies in Base-Rate Problems.- Modes of Thought and Problem Framing in the Stochastic Thinking of Students and Experts (Sophisticated Decision Makers).- II.- Stochastic Thinking, Modes of Thought, and A Framework for the Process and Structure of Human Information Processing.