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Occamism differed from the other Scholastic schools on two major points: first, Occamism strongly argued position that only individuals exist, rather than supra-individual metaphysical universals, essences, or forms, and that universals are the products of abstraction from individuals by the human mind and have no extra-mental existence. Second, Occamism denied the real existence of metaphysical universals and advocated the reduction of ontology.
Content and method
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Occamism question the physical and Aristotelian metaphysics and, in particular, insists the only reality of individuals accessible to knowledge intuitive. The universals, which exist only in the mind, have no correspondence with reality and are mere signs that symbolize a multiplicity of individuals. The further one goes from experience and generalizes, the more one imagines the constitution of the universal expressed by names. It is therefore necessary to revise the logical structures of discourse and language, taking care to separate the sign from the signified thing. Criticism of the concept of cause and substance, especially by the Occamistic Nicholas of Autrecourt, reduces the sciences to an immediate and intuitive way of knowing.
The Occamists using the Nominalist method separate theology from Aristotelian foundations, making them lose any possibility of presenting themselves as science, and reducing confidence in the power of reason applied to the demonstrations of God's existence and the immortality of the soul. They support God's absolute power that explains the contingency of creatures and the laws of nature. Divine omnipotence also includes the case that God can also comprehend a nonexistent object: an anticipation of the "deceptive God" a theme used by Descartes in solving the certainty of the cogito ergo sum.
- ^α De contemptu mundi (book 1, v. 952) satirical work by Bernard of Cluny, a Benedictine monk of the 12th century who used to attack the corruption of the laity and the Church of his time and who, in addition to the moralistic intent, mentioned the nominalistic polemic of the twelfth century against the reality of universals: a debate that according to philosophical historiography will be taken up by Occamism in the fourteenth century.  According to other authors instead it is to be excluded that Occamism resumes the nominalistic theses but rather that it expresses regarding the question of the universals the doctrine of the conceptualism. 
- Baird, Forrest E.; Walter Kaufmann (2008). From Plato to Derrida. Upper Saddle River, New Jersey: Pearson Prentice Hall. ISBN 0-13-158591-6.
- Garzanti's Encyclopedia of Philosophy, ibid.
- William J. Courtenay, Ockham and Ockhamism: Studies on the Dissemination and Impact of His Thought , 9004168303, 9789004168305, 9789047443575, Brill Academic Pub., 2008.
- Dizionario di filosofia Treccani (2009), ibidem
- In Dictionary of philosophy Treccani (2009)
- In Enciclopedia Garzanti di Filosofia
- Brundage, James (2008). "Canon Law in the Law schools". The history of medieval canon law in the classical period. Catholic University of America Press (Wilfried Hartmann & Kenneth Pennington, eds.). p. 115. ISBN 0813214912.
- Panaccio, Claude (2004). Ockham on Concepts. Aldershot: Ashgate. ISBN 978-0-7546-3228-3.
- Francesco Bottin, The Science of Occamists. Late medieval science, from the origins of the nominalist paradigm to the scientific revolution , Maggioli 1982.
- William J. Courtenay, Ockham and Ockhamism. Studies in the Dissemination and Impact of His Thought, Leiden, Brill 2008.
- Christian Rode, A Companion to Responses to Ockham, Leiden, Brill 2016.