JEDEC – The part-to-part skew time between corresponding terminals of two samples of an integrated circuit from a single manufacturer.

TI –The magnitude of the difference in propagation delay times between corresponding terminals of two DSP devices when both devices operate with the same supply voltages, operate at the same temperature, have identical package styles, have identical specified loads, have identical internal logic functions, and have the same manufacturer.

Process variation is the only factor that affects process skew.