A central component of my CHI project is working with historical data. The creation of a database from historical documents is a long and tedious process, so I have decided to use one already available online. A group of economic historians published the African Commodity Trade Database (ACTD) by working with the Rural Environment History Group at Wageningen University. One of their datasets includes more than nine thousand commodities exported from Africa from the early nineteenth century to World War II. I plan to build from their work by transforming some of their data into visualizations on a website. This process includes several decisions that will shape my final visualizations and the historical contextualization I will contribute to explaining them. I’ve described part of that process below by highlighting some of the decisions I’ve made in selecting which data to use.