Systems engineering terms, explained for early-stage builders
Clear definitions for model-based systems engineering, traceability, interfaces, verification, trade studies, and the digital thread.
These explainers define the concepts first, then show how Cairn uses them in a lightweight AI-native modeling workflow.
Modeling foundations
Model-based systems engineering
Model-based systems engineering uses structured models to represent system architecture, requirements, behavior, interfaces, verification, and relationships.
Read explainerTermSysML v2
SysML v2 is the next-generation systems modeling language for representing architecture, behavior, requirements, verification, and relationships in model-based systems engineering.
Read explainerRequirements & traceability
Requirements traceability
Requirements traceability links requirements to design elements, verification methods, dependencies, and decisions so teams can understand coverage and impact.
Read explainerTermInterface control document
An interface control document defines how systems, subsystems, or components connect, including signals, protocols, data, power, and responsibilities.
Read explainerTermDigital thread
A digital thread connects engineering artifacts across a product lifecycle so teams can trace requirements, design, verification, decisions, and changes.
Read explainerBehavior & verification
State machine
A state machine models system behavior as states and transitions, often including triggers, guards, actions, and operating modes.
Read explainerTermVerification methods
Verification methods explain how teams prove requirements are satisfied, commonly through inspection, analysis, demonstration, or test.
Read explainerDecisions & governance
Trade study
A trade study compares design alternatives against criteria so engineering teams can make and preserve decisions with clear rationale.
Read explainerTermPugh matrix
A Pugh matrix compares design alternatives against criteria, often using a baseline concept to score relative strengths and weaknesses.
Read explainerTermChange control
Change control is the process of reviewing, approving, and tracking changes to requirements, designs, interfaces, and other engineering artifacts.
Read explainerGlossary pages explain the language. Cairn pages show the workflow: features explain model operations, use cases explain who they help, comparisons explain where the tool fits, and docs explain the underlying data model.