Graphology Character Diagram, and the Muller-Enskat Protokol are other psychogram methods. Psychologists Leopold Szondi, Augusto Vels, and Girolamo Moretti invented their personal schools of graphology. Four academic institutions offer an accredited degree in handwriting analysis: The majority of material in the field is oriented toward the Latin writing system. Courses offered in the subject reflect that bias. Every system of handwriting analysis has its own vocabulary. Even though two or more systems may share the same words, the meanings of those words may be different. The technical meaning of a word used by a handwriting analyst, and the common meaning is
What Love Is Made Of extremely positive about "What Love Is Made Of", describing it as "darker than anything" from "On a Mission", while calling it "slinky". The reviewer went on to commend the "irresistibly pouty" chorus. Pitchfork Media's Katherine St. Asaph commented that, in the song, the singer "sound[ed] completely enthralled, by either her lover or the music" and complimented her voice, noting that it seemed "ten times bigger than before". Jordan Sargent of "Spin" magazine called the track "exuberant" and highlighted Katy's vocal performance, which he deemed "typically fantastic", while the team from pop music website Popjustice gave "What Love Is Made Of"