This volume contains selected papers presented at the 12th International C- ference on Conceptual Structures, ICCS 2004, held in Huntsville Alabama, July 19-23, 2004. The main theme of the conference, "Conceptual Structures at Work", was chosen to express our intention of applying conceptual structures for hum- centered practical purposes. That invites us to develop not only clear conceptual theories,butalsomethodstosupporthumansintheapplicationofthesetheories in their societies. Some promising steps in this direction are being taken, but the gap between the researchers working on a highly sophisticated level on one side and the practitioners in many ?elds of applications on the other side is usually di?culttobridge.Someofushaveexperiencesinsuchpracticalcooperation,but we need more members of our community to be engaged in "real life problems". We all know that solutions of complex problems in practice require not only a well-developed formal theory, but also an understanding of the whole context of the given problems. To support our understanding we need general philo- phical methods as well as formal theories for the representation of fundamental structures in practice. We believe that our community has powerful tools and methodsforsuccessfulapplicationsinpractice,butthatwemustdevelopaforum to present our results to a broader audience. First we must understand the s- ni?cant developments in our own group, which has activities in many directions of research.

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Invited Talks.- The Esthetic Grounding of Ordered Thought.- Memes as Signs in the Dynamic Logic of Semiosis: Beyond Molecular Science and Computation Theory.- Graphics and Languages for the Flexible Modular Framework.- Implicational Concept Graphs.- Types and Tokens for Logic with Diagrams.- From Data to Conceptual Structures.- Concept-Based Data Mining with Scaled Labeled Graphs.- Iceberg Query Lattices for Datalog.- 'Particles' and 'Waves' as Understood by Temporal Concept Analysis.- A Void Type for Medical Language Disambiguation.- Clustering of Conceptual Graphs with Sparse Data.- Concept Lattices and Concept Graphs.- A Cartesian Closed Category of Approximable Concept Structures.- Implications in Triadic Formal Contexts.- Exploring Relational Structures Via .- An Extension of the Theory of Information Flow to Semiconcept and Protoconcept Graphs.- Negation in Contextual Logic.- Conceptual Frameworks for Applications.- Using Brandom's Framework to Do Peirce's Normative Science: Pragmatism as the Game of Harmonizing Assertions?.- Improving the Testbed Development Process in Collaboratories.- Relation Elements for the Semantic Web.- Poset Ontologies and Concept Lattices as Semantic Hierarchies.- Concept Types and Coreference in Simple Conceptual Graphs.- An Exportable CGIF Module from the CP Environment: A Pragmatic Approach.- Reasoning with Conceptual Structures.- Using Conceptual Graphs to Represent Agent Semantic Constituents.- Improving Generalization Level in UML Models Iterative Cross Generalization in Practice.- KNAML: A Knowledge Representation Language for Distributed Reasoning.- Interoperability of Ontologies Using Conceptual Graph Theory.- A Priorean Approach to Time Ontologies.