Previous findings have shown that, under certain conditions, the stress concentration factorKtin an anisotropic material can be written as 1+FmFswhere the material factorFmand the shape factorFsare uncoupled. For illustration, the stress concentration problem of an elliptic hole is briefly discussed and the correspondingFmandFsare identified. The shape factor of a slot is proposed by interpolating two limiting values in an isotropic material. The accuracy of this expression is demonstrated by comparing the present predictions with the existing numerical values ofKtin isotropic and orthotropic materials.