BEEHAVE is a computer model to simulate the development of a honeybee colony and its nectar and pollen foraging behavior in different landscapes. The purpose of BEEHAVE is to allow multiple stressors of honeybee colonies within a hive and in the landscape to be represented, either alone or in combination, to understand their potential influence on colony development and survival: e.g. varroa mites transmitting deformed wing virus (DVW) or acute paralysis virus (APV), effects of several beekeeping practices, poor forage availability or even forage gaps in the landscape, and pesticide-induced losses of in-hive bees and foragers, in-hive bees, or brood. The design of BEEHAVE is based on empirical data, expert knowledge, and earlier honeybee models, but BEEHAVE is the first model that integrates within-hive processes with an explicit representation of foraging in heterogeneous and dynamic landscapes.