Product Life-Cycle & Portfolio

Agile vs. Waterfall in Hardware Development

Match delivery method to physical constraints without losing speed. Use hybrid patterns—sprints inside gates, digital twins, and HIL—to cut risk before tooling.

Why do many hardware teams use a hybrid of Agile inside Stage‑Gate rather than pure Agile?

physical constraints and long lead times require gates, while sprints de‑risk design between gates

pure Agile forbids any stakeholder reviews

gates are only for software security reviews

waterfall never uses reviews or sign‑offs

Gates protect capital around tooling and compliance decisions. Iterative sprints inside stages cut risk before committing.

Digital twins and simulation help Agile hardware by ______.

guaranteeing zero field defects

replacing configuration management entirely

shifting testing left to validate behaviour before expensive prototypes

removing the need for any physical testing

Model‑based verification catches issues early and cheaper. It complements, not replaces, later physical tests.

Hardware‑in‑the‑loop (HIL) test rigs enable ______.

performance marketing experiments

elimination of regression testing

only manual end‑user acceptance testing

continuous integration of firmware with electronics and mechanics in realistic loops

HIL connects controllers to simulated plants to exercise edge cases safely. It supports frequent build‑test cycles.

In a hybrid model, interface ‘freezes’ and envelope constraints exist to ______.

let teams iterate internals while preserving compatibility across modules

avoid documentation entirely

optimise for aesthetics over function

prevent any design changes after sprint 1

Stabilised interfaces decouple work and reduce rework risk. They enable parallel iteration without breakage.

Over‑the‑air (OTA) capability affects development by ______.

removing the need for security reviews

eliminating supply‑chain constraints

making hardware regressions impossible

allowing safe post‑launch fixes and feature flags, which reduces the cost of some late changes

OTA lets teams patch and refine in the field under controls. It does not remove the need for rigorous pre‑release testing.

Compared with software, late design changes in hardware are costly mainly due to ______.

A/B test platform limits

scarcity of cloud compute credits

licensing fees for IDEs

tooling, lead times, and compliance testing that must be repeated

Physical changes ripple through tooling and certification schedules. That’s why early validation is critical.

A hardware team’s Definition of Done should include ______.

DFM/DFA checks, traceability, and safety/compliance evidence for the current maturity level

only a demo video and stakeholder sign‑off

marketing launch date pencilled in

code coverage above 80% regardless of function

Manufacturability and compliance are part of completion in physical products. Evidence reduces late surprises.

To maintain flow, backlogs for hardware should explicitly track ______ risks.

BOM, long‑lead components, and supplier lead‑time constraints

social‑media sentiment

SEO keywords for the launch

design team seating charts

Supply dependencies drive schedules and batching. Making them visible enables proactive mitigation.

A practical cadence alignment is to map sprints to ______.

finance quarter close dates only

press‑release milestones only

prototype build cycles (EVT/DVT/PVT) with gates at each transition

random week counts that ignore lab availability

Build events create natural integration points. Gates verify readiness before moving to the next maturity step.

Continuous integration for embedded systems most often relies on ______.

crowd‑testing through public betas before any lab work

emulators, simulators, and automated fixture tests tied to each commit

manual weekly bench testing only

marketing teams executing test scripts

Automated benches and emulators shorten feedback loops. They complement but do not replace full lab and field testing.

Starter

Good start—review key concepts and try the quiz again.

Solid

On track—tighten judgement under edge cases and scenarios.

Expert!

Exceptional portfolio judgement—apply it to your toughest calls.

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