Dean did a meta-analysis on some studies: Dean showed that graphologists have failed unequivocally to demonstrate the validity or reliability of their art for predicting work performance, aptitudes, or personality.
It usually indicates that the writer is optimistic; also it could be found if the person is excited or happy while writing. He called it "the science of the future" despite rejection of his results by graphologists.
After you develop some basic graphology skills, you might have some questions your reference book doesn't answer.
The German psychoanalyst-graphologists added more identifying signs; if someone put a lot of pressure on the pen, for instance, he had a strong libido. Graphology is not just popular among hobbyists, however. In practice, this can lead the graphologist to interpret signs positively or negatively depending on whether the subject has high or low social status.
Research studies have been conducted in which a detailed examination of handwriting factors, particularly timing, fluidity, pressure, and consistency of size, form, speed, and pressure are considered in the process of evaluating patients and their response to pharmacological therapeutic agents.