Downloadable computer software for formal verification of architectural-level interface composition in engineered systems, namely, software implementing a typed contract algebra with assume-guarantee semantics for specifying, composing, and proving correctness of component interfaces, for refinement and conformance verification of system-component specifications against interface descriptions, for composing component contracts under shared-resource constraints with surfaced feasibility side conditions, for bidirectional editing between contract algebra source and block-diagram representations of system architectures with verification-state propagation from a machine-checked formal model, and for surfacing underdetermined assumptions as typed metadata; downloadable software libraries, development kits, and modules for formal verification and model-based systems engineering; downloadable verified-component libraries for formal verification of engineered systems.

Software as a service (SAAS) services featuring software for formal verification of architectural-level interface composition in engineered systems, namely, software implementing a typed contract algebra with assume-guarantee semantics for specifying, composing, and proving correctness of component interfaces; software as a service (SAAS) services featuring software for refinement and conformance verification of system-component specifications against architectural-level interface descriptions; software as a service (SAAS) services featuring software for composing component contracts under shared-resource constraints with surfaced architectural-feasibility side conditions; software as a service (SAAS) services featuring software for bidirectional editing between formal contract algebra source representations and block-diagram graphical representations of system architectures, with verification-state propagation from a machine-checked formal model; providing temporary use of non-downloadable computer software for surfacing underdetermined assumptions in system architecture specifications as typed metadata; technological consultation services in the field of formal verification of architectural-level interface composition, contract-based design, and assume-guarantee reasoning for engineered systems; scientific and technological research services in the field of formal methods and contract-based system architecture; software design and development services, namely, custom calibration of contract algebra vocabularies to specific engineering domains; engineering services, namely, providing formal verification of system architectures using contract-based methods.