This document outlines the requirements for a research proposal to investigate whether there is an association between body mass index (BMI) and asthma. The proposal must include: 1) A justification for the chosen study design over other options. 2) Selection of a statistical measure to describe any association between BMI and asthma. 3) Details on subject selection, measurement of exposure/outcome, and potential biases and how to address them. 4) Consideration of possible confounding factors and effect modifiers. The proposal must be 750-1000 words and address the key elements outlined, including study design, statistical measures, subject selection, and measurement issues. At least three scholarly sources must be referenced.