The purpose of this dissertation is to explore and analyze a domain of research thought to be shared by two areas of philosophy: computational and digital ontology. Computational ontology is philosophy used to develop information systems also called computational ontologies. Digital ontology is philosophy dealing with our understanding of Being and human existence in terms of the digital. While computational ontology accounts for reality as that which is disclosed to us by natural science--reality independent of human experience--digital ontology always begins with and refers back to the human being in its analysis of Being. The methodology in this dissertation is phenomenology. Both computational and digital ontology are represented using instrumental case studies. The findings consist of essential components shared by computational and digital ontology, the modes in which they appear, and philosophical questions to explore in future research. Ultimately, this dissertation concludes that there is a domain shared by computational and digital ontology in spite of some fundamental differences between the two. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]