Abstract
This chapter focuses on the analysis of genotype–environment interaction (GEI) based on available crop yield data aimed to define adaptation strategies and yield-stability targets for a region targeted by a breeding programme. The importance of sufficient knowledge on GEI patterns and relevant environmental factors and adaptive traits in devising a breeding strategy aimed to maximize the crop yield potential under specific or prevailing cropping conditions and to minimize the occurrence of very low yields or marked inconsistency of performance across target environments are also discussed.