The relationship between orientation and miscibility in polymer blends has been investigated for blends of poly(epsilon-caprolactone)/poly(styrene-co-acrylonitrile) (PCL/SAN), containing from 23 to 38wt% acrylonitrile. The miscibility of the blends was characterized by d.s.c. whereas the strain-induced orientation of both PCL and SAN chains, in blends containing between 2% and 20% PCL, was measured by Fourier transform infra-red (FTi.r.) dichroism. PCL orientation was observed in miscible matrices but not in immiscible SAN matrices, indicating that the miscibility leads to the orientation, and the maintenance of orientation, bf the minor chain component, despite the fact that flexible chains are involved. In contrast, the major component, SAN, exhibits a similar orientation in the different PCL/SAN systems, and is little influenced by the addition of PCL. The results are discussed in terms of miscibility, chain entanglements, friction coefficients and chain flexibility.