Security book alignment

windows/security/security-foundations/msft-security-dev-lifecycle.md

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+---
+title: Microsoft Security Development Lifecycle
+description: Download the Microsoft Security Development Lifecycle white paper that covers a security assurance process focused on software development.
+ms.prod: windows-client
+author: aczechowski
+ms.author: aaroncz
+manager: dougeby
+ms.topic: article
+ms.localizationpriority: medium
+ms.technology: itpro-security
+ms.date: 12/31/2017
+---
+
+# Microsoft Security Development Lifecycle
+
+The Security Development Lifecycle (SDL) is a security assurance process that is focused on software development. As a Microsoft-wide initiative and a mandatory policy since 2004, the SDL has played a critical role in embedding security and privacy in software and culture at Microsoft. 
+
+[:::image type="content" source="images/simplified-sdl.png" alt-text="Simplified secure development lifecycle":::](https://www.microsoft.com/en-us/securityengineering/sdl)
+
+With the help of the combination of a holistic and practical approach, the SDL aims to reduce the number and severity of vulnerabilities in software. The SDL introduces security and privacy throughout all phases of the development process. 
+
+The Microsoft SDL is based on three core concepts:
+- Education
+- Continuous process improvement
+- Accountability
+
+To learn more about the SDL, visit the [Security Engineering site](https://www.microsoft.com/en-us/securityengineering/sdl).
+
+And, download the [Simplified Implementation of the Microsoft SDL whitepaper](https://go.microsoft.com/?linkid=9708425).