This document provides instructions for sampling cassava plants for genotyping using the Cassavabase database and Coordinate mobile app. It describes how to: 1. Design a field trial and generate barcodes in Cassavabase 2. Use the Coordinate app to collect samples according to the trial template and export the sample data 3. Upload the template and sample data to Cassavabase 4. Submit the genotyping order to the service provider The goal is to efficiently collect samples from the field trial and prepare the data for genotyping.