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The role of space-time structuring processes has recently come into focus as an important ingredient in the understanding of cooperative interactions in different contexts (Boerlijst and Hogeweg, 1991; Hemelrijk, 1997; Di Paolo, 1997; Di Paolo, 1998). This paper explores a similar role for a different sort of contextual process: phenotypical development under social conditions. A minimal ontogenetic, reaction-network model maps newborn phenotypes into adult ones according to genetic constitution and parental influence. In this way three coupled processes determine the distribution of behaviors within a population: selection, development and spatial organization. The presence of dynamic “developmental structures” is shown to play an important role in stabilizing cooperative coordination even when individual costs are against it. Resulting coordination levels prove to be much more stable than with spatial distribution alone. Some of the resulting self-promoting and self-regulating developmental structures are discussed.