This document discusses good practices for formatting Excel spreadsheets used for research data. It describes including a data definition sheet with variable names and definitions. The data sheet then contains the column headers matching the variable names and data values. Formatting guidelines are provided, such as centering and bolding lowercase column headers, right aligning dates and numbers, and left aligning text. Consistent formatting across sheets is also recommended, including column spacing, fonts, and removing grid lines. An exercise is included to practice applying these guidelines.