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| One pattern, three sizes | |||||
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| A base size 12 pattern (left) can be graded up to a size 16 (center) using the cut-and-spread method, and similarly graded down to a size 6 (right) by cutting and overlapping along specified cut lines. | |||||
Methods of gradingThere are three basic methods of grading: cut and spread, pattern shifting, and computer grading. No one method is technically superior and all are equally capable of producing a correct grade.
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| Cut-and-spread method: The easiest method, which is the basis of the other two methods, is to cut the pattern and spread the pieces by a specific amount to grade up, or overlap them to grade down. No special training or tools are required-just scissors, a pencil, tape, and a ruler that breaks 1 in. down to 1/64. |
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| Pattern shifting: Pattern shifting is the process of increasing the overall dimensions of a pattern by moving it a measured distance up and down and left and right, (using a specially designed ruler) and redrawing the outline, to produce the same results as the cut-and-spread method. |
The most recent development, computer grading, is the fastest method, but tends to be an investment only larger manufacturers can afford. However, sophisticated home computer software is becoming affordable.
