Which phase in secure application design and development includes threat modeling?

Threat modeling is performed during the Design phase of secure application development. Managing Cloud guidance explains that threat modeling evaluates application architecture, data flows, trust boundaries, and attack surfaces before development begins.

By identifying threats early, security controls can be built directly into the application design rather than added later. This reduces vulnerabilities and lowers remediation costs.

The define phase establishes requirements, training builds skills, and development focuses on coding. Therefore, the design phase is the correct answer.