This document outlines the objectives and methodology for a GCSE fieldwork assignment on how and why natural features vary along the River Alyn in Wales. Students will observe and describe river landforms and collect data on changes to the river channel and materials transported downstream. They will use methods like field sketching, pebble analysis, and flow depth and velocity measurements. Higher-level students will explain how landforms are shaped by erosion and deposition processes and analyze trends in the collected data. Students will write a 1,200-word report presenting their findings and evaluating their fieldwork methods.