If you’re preparing for the SOA Exam C or CAS MAS-II, understanding how to implement Poisson and Renewal processes is a must-have skill. These stochastic processes form the backbone of many actuarial models, especially in insurance and risk management. They help us model the timing and frequency of random events like claims or arrivals, which are crucial for pricing, reserving, and risk assessment. Here, I’ll walk you through the essentials of these processes, share practical examples, and offer tips that have helped me master these topics.