Identifying and Reusing Concepts
Ontology alignment, or ontology matching, is the process of determining correspondences between concepts.
OntologyMatching.org provides a list of publications , presentations and other information on ontology matching.
Prefix.cc provides help in finding the common prefix of an ontology and also matching a prefix to the URI of an ontology.
Identifying Concepts and Creating Linked Data
Jeni Tennison has a series of articles describing the process of identifying concepts in the context of creating Linked data for the UK governments data project.
Finding Concepts within existing Ontologies
Finding Concepts in the Bioscience Domain