Hansjörg Gaus is head of the department Environment, Climate & Nature at CEval GmbH. His work focuses on project, programme and strategy evaluations as well as consulting projects, also in the fields of education, science and research. Hansjörg was managing editor of the journal Zeitschrift für Evaluation for more than ten years and has published numerous articles in journals and edited volumes, especially on evaluation methodology and environmental and consumer issues. He studied business administration at the University of Mannheim, graduating with a Diplom-Kaufmann degree, and received his doctorate from Chemnitz University of Technology with an empirical thesis on consumer behaviour research.