This Jubilee set of three volumes constitutes a condign tribute to Yaacov Choueka, a computer scientist, mathematician, computational linguist, and lexicographer: he is one of the founders of the fields of full-text information retrieval, computational linguistics, humanities computing, and legal databases. The three volumes (LNCS 8001–8003) comprise 61 chapters, and are each devoted to a broad theme. The focus of the first is computing, its theory, techniques, and applications to science or engineering; of the second - how computing serves the humanities, law, or narratives; of the third: linguistics, computational linguistics, and ontologies. The present first volume, Computing - Theory and Technology, contains 22 chapters, clustered around the themes: The Jubilarian: Yaacov and his Oeuvre, Theory of Computation, Science Computing and Tools for Engineering, and Information Retrieval.