Most patterns will specify a target Gauge that must be met in order to ensure proper sizing. This is doubly true of larger pieces, where a variation in gauge can multiply across the piece. Thus, a vital first step when beginning a project is the creation of a gauge swatch, a small piece of knitting created in order to determine the gauge generated by a given combination of yarn weight and Needle size. In any case, a Gauge ruler is an invaluable tool, particularly for patterns that require a very specific gauge. With it, one can regularly check to ensure that the gauge is correct and consiste.