The BEST time in the SDLC process for an application service provider to perform Threat...

Threat modeling is a core element of the Microsoft Security Development Lifecycle (SDL) and a structured approach to identify, quantify, and address the security risks associated with an application12. Threat modeling helps to shape the application’s design, meet the security objectives, and reduce risk1. The best time to perform threat modeling analysis is before the application design and development activities begin, as this allows the application service provider to:

Communicate about the security design of their systems1.

Analyze the design for potential security issues using a proven methodology1.

Suggest and manage mitigations for security issues1.

Incorporate security requirements into the design2.

Avoid costly rework or redesign later in the SDLC2.

Identify the most critical and relevant threats to focus on2. References: 1: Microsoft Security Development Lifecycle Threat Modelling1 2: Threat Modeling Process | OWASP Foundation2