Scrum The Scrum Guide, November 2020 (official current version reviewed 25 August 2026) | One cohesive Scrum Team is solving a complex product problem and can inspect a usable Increment against a Product Goal in Sprints. | Keep the Scrum accountabilities, events, artifacts and commitments intact; selected supporting practices do not become Scrum by name. | Scrum can organise team-level empirical product development inside a Product System gate; the gate supplies the wider business, field and assurance decision. A Sprint boundary does not by itself prove hardware integration, field acceptance, safety, commercial viability or release readiness. |
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Kanban The Kanban Guide, May 2025 (v2025.5, reviewed 25 August 2026) | Work arrives continuously, service and integration demand varies, or the organisation needs to improve effectiveness, efficiency and predictability through flow. | Define and visualise the workflow, actively manage items, improve the workflow, control work in progress and use context-relevant flow metrics. | Kanban can manage evidence, delivery, integration, service or portfolio flow between Product System decisions and can complement other delivery techniques. A board without an explicit Definition of Workflow, work-in-progress control and improvement loop is visual task tracking, not sufficient method evidence. |
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Nexus The Nexus Guide, January 2021 (reviewed 25 August 2026) | Approximately three to nine Scrum Teams work from one Product Backlog toward one integrated product and cross-team dependencies are the central constraint. | Retain Scrum, one Product Owner, one Product Backlog, a Nexus Sprint Goal and an Integrated Increment; add the Nexus Integration Team and Nexus events as defined. | Nexus can coordinate multi-team product development inside a shared Product System product boundary and evidence gate. Do not add a scaling framework when product boundaries or integration ownership are still unclear; fewer teams may reduce complexity more effectively. |
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SAFe Current Scaled Agile Framework web guidance (reviewed 25 August 2026) | A real portfolio and multiple teams or trains need strategy-and-investment alignment, portfolio governance and coordinated solution delivery across value streams. | Define the portfolio and value streams, make funding and governance explicit, and organise teams around a shared business and technology mission rather than copying ceremonies. | SAFe can provide portfolio and multi-team flow around Product System decisions; the Product System still defines the product claim, evidence gate and reversal condition. Use only the coordination needed by the actual scale and dependencies. Framework installation is not evidence of customer value, technical quality or organisational transformation. |
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Systems engineering and verification NASA Systems Engineering Handbook Rev 2 (reviewed 25 August 2026) | The product spans interacting hardware, software, people and environments and needs disciplined definition, realisation, verification, validation and technical management. | Maintain requirement, interface, configuration, verification and validation traceability appropriate to the system and its risk. | Systems engineering supplies technical authority and evidence across discovery, productization, integration, launch and change; product leadership integrates it into the product decision. Technical verification does not decide market value, adoption, pricing or portfolio priority, and product leadership does not replace engineering authority. |
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Continuous delivery and DORA DORA software delivery performance guidance, updated 5 January 2026 (reviewed 25 August 2026) | A software or service path needs safer, faster change flow with system-level feedback on throughput and deployment instability. | Measure the current five metrics in application or service context: change lead time, deployment frequency, failed-deployment recovery time, change fail rate and deployment rework rate. | Delivery performance informs productization, launch and scale decisions; Physical AI adds hardware, integration, field, safety and service evidence beyond software deployment. Do not turn delivery metrics into individual targets or treat software deployment speed as the complete operated-product outcome. |
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