Glossary · Evidence, assurance and traceability
Digital thread
In systems engineering, a digital thread is a connected information path across the lifecycle from requirements and risks to design, tests, documentation, and field data. It links data held in different tools so that each item can be followed to its origins and consequences.
- Systems engineering
- Data and interfaces
In one sentence
A digital thread connects requirements, risks, design, tests, documentation and field data across tools and lifecycle phases.
Example
In a machine builder's digital thread, a change to a conveyor motor in the PLM system is linked to the affected safety function, the stopping time test, the maintenance manual topic and the installed machines in the field.
How it applies
- Integrated systems: A digital thread depends on stable identifiers and defined interfaces between PLM, ALM, requirements, test and documentation tools. Each item needs one source of truth.
- Evidence: The thread makes traceability usable in practice: impact analysis for a change becomes a query instead of a document search.
- Technical documentation: Documentation is part of the thread, not an end point. Semantic metadata such as iiRDS can link topics to products, components and lifecycle phases.
- AI and retrieval: Linked, versioned data give AI assistants context they can cite. Without the thread, retrieval returns fragments without knowing whether they apply.
Digital thread vs. digital twin
A digital twin is a model of a specific physical asset that mirrors its state. The digital thread is the network of links between lifecycle data, including the data a digital twin uses.
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