We describe (and demonstrate) the execution model of a computing platform where computation is both incremental and data-driven. We call such an approach delta-driven. The platform is intended as a delivery vehicle for semantically integrated software, and thus lends itself to the semantic web, domain-driven development, and next-generation software development environments. Execution is transparent, versioned, and persistent. This technology - still at an early stage - is called domain/object. Categories and Subject Descriptors D.2.6 [Software Engineering]: Programming Environments – interactive environments; D.2.11 [Software Engineering]: Architectures – data abstraction, patterns; D.2.12 [Software Engineering]: Interoperability – data mapping; D.3.2 [Programming Languages]: Language Classifications - data-flow languages; D.3.3 [Programming Languages]: Language Constructs and Features – constraints; D.3.4 [Programming Languages]: Processors – code generation, incremental c...