It is shown, through an electron localization function (ELF) analysis of the strain in carbon compounds, that, globally, the valence basins V(CH) and V(CC) tend to preserve a VSEPR (valence shell electron pair repulsion) geometry. This point is clearly illustrated by the valence attractors location. The properties of V(CC) basins, associated with the CC bonds, remain as constant as possible. The main effect of the strain is to modify the maximal electron localization in each V(CC) basin. This study points out once more the difficulty in relating global strain to local bond properties.