This thesis explores the transition to passwordless technologies, a critical subject I developed during my master's studies and further refined during an internship at Microsoft. While passwordless authentication is a growing area of interest, most studies focus on the individual technologies behind it, such as security keys, biometrics, and magic links. However, little attention has been paid to the integration of these technologies within existing architectures, which is essential for a successful transition from traditional password-based systems. To bridge this gap, the thesis presents a framework for effectively planning and executing a shift to passwordless authentication. It begins by defining the core services required to integrate various passwordless methods, followed by an approach to assess and design target architectures.