Patent ID: 8334968

Claim:
A method of determining a value of an exposure parameter when an image of a plurality of types of patterns formed on a reticle are transferred onto a substrate by exposure, the method being executed by a computer, the method comprising: setting a value of the exposure parameter; calculating an optical image of the plurality of types of patterns for a plurality of values of at least one of an exposure amount and a defocus amount using the set value of the exposure parameter, obtaining a range, of the values of at least one of the exposure amount and the defocus amount, within which a deviation between a contour of a target optical image and a contour of the optical image calculated in the calculating step is not more than an allowable value, for each of the plurality of types of patterns; changing the exposure parameter and repeating the calculating step and the obtaining step using the changed exposure parameter; and determining a value of the exposure parameter, at which a minimum value among the ranges, calculated in each of the plurality of types of patterns using calculation results in the calculating step, the obtaining step and the repeating step, is maximum.