Patent ID: 7537869

Claim:
A method for evaluating a pattern formation process, comprising: applying a photoresist film on a substrate; transferring a first pattern and a second pattern adjacent to or at least partly overlapped with each other to the photoresist film, wherein the first pattern includes a plurality of lines consisting of transparent regions, having the same length and a line-width less than or on the order of wavelengths of visible light, periodically located parallel to one another with end portions aligned on both sides thereof, and the second pattern comprises a transparent region having a larger area compared with each of the lines; obtaining an image of a first transferred pattern by an optical measurement means, the first transferred pattern formed on the substrate by transferring the first pattern to the photoresist film, the first transferred pattern including a plurality of transferred lines corresponding to the lines; and determining a variation of length of the image in a direction parallel to the transferred lines.