This lesson explores Walmart’s blockchain food-traceability system: how a global retailer has been moving from days-long recalls to near-instant tracking, and what that has been meaning for suppliers, customers, and rivals. Learners use the present perfect continuous to describe ongoing change — what companies have been requiring, how vendors have been adapting, and how trust in food safety has been shifting. Activities include: timeline activities, sequencing activities, business presentations, speaking practice, business case studies and case studies. Grammar focus: Present Perfect Continuous. Business skills: Case Study Analysis, Supply Chain Management and Innovation Assessment.