This document is an assignment on research in mathematics education. It discusses the nature of research in mathematics education compared to mathematics. It notes that while mathematics uses proofs, research in mathematics education uses various forms of evidence to build understanding. It outlines the main purposes of research in mathematics education as understanding mathematical thinking and learning as well as improving instruction. It also discusses standards for evaluating theories and models in mathematics education research, including descriptive power, explanatory power, scope, predictive power, rigor, falsifiability, replicability, and using multiple sources of evidence. The document concludes by emphasizing that mathematics education research is still a young field with progress being made to build robust theory and methods.