It is the 50th anniversary of the Environmental Impact Assessment (EIA), a significant step forward toward making engineering more socially responsible. But a growing number of policymakers are now voicing the need for an approach to assess the human and social impacts of intelligent systems. We discuss how the EIA provides a partial blueprint for what we call a Human Impact Assessment for Technology (HIAT) and how more recent algorithmic and data protection impact assessment initiatives can contribute. We also discuss how ethical frameworks for such a human impact assessment could draw on recently established AI ethics principles. We argue that this approach will help build trust in an industry facing increasing criticism and scrutiny.