This is a resource that I have used in my Algebra 2, Algebra 3, College Algebra, and Calculus classes. It takes students through the process of deciding which type of factoring to use (2 term special cases, 3 terms perfect squares or guess and check, 4 terms factor by grouping). My students continue to refer to this chart when they go to college! I have even had a colleague tell me that she was given MY flowchart when she attended a conference (not sure how that happened, but I take it as a compliment). I have added a special case to cover Sum of Squares, that factors using complex numbers!