This whitepaper provides a practical guide to mastering threat modeling as a foundation for secure by design and privacy by design software development. It explains why threat modeling is essential for teams building systems that must meet functional requirements while defending against an expanding range of security and privacy risks. The paper covers core concepts such as what threat modeling is, who should participate, and why it should be embedded early in development. It introduces a four‑question framework and outlines clear steps including scoping, diagramming, analysis, and retrospectives. Common pitfalls are addressed with guidance on avoiding them, helping teams adopt consistent, effective practices. The whitepaper also explains how Devici supports scalable, collaborative threat

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