Graphology is a blend of art and science. It is a science because it measures the structure and movement of the written forms - slants, anglesand spacing are accurately calculated and the pressure is observed in magnification and with precision. And it is an art because the graphologist has constantly to keep in mind the total context in which the writing is taking place: the 'gestalt' of the writing as a whole.
Writing consists of three things - movement, spacing andform. A graphologist studies these variations as they occur in each of these aspects of writing, and attaches psychological interpretations to them. Expert graphologists can achieve a very high degree of accuracy.