first phase (direct comparison) : the sizes of quantity bigger or smaller, are determined by a direct perceptive comparison. in the upper-left picture in figure 1, after lining up the edges of two objects sizes (length) are visually compared
first phase (direct comparison) : the sizes of quantity bigger or smaller, are determined by a direct perceptive comparison. in the upper-left picture in figure 1, after lining up the edges of two objects sizes (length) are visually compared