What is the most cost-effective approach to upgrade a heavily customized AEM 5.6 client?

The choice to migrate to version 6.4, configure ClassicUI, create a new project, and then gradually migrate to Touch UI is the most cost-effective approach for several reasons.

First, upgrading to a more recent version of AEM, such as 6.4, provides access to enhanced features, security improvements, and support for better performance and functionality. AEM 5.6 is an older version, and staying on it could lead to missed opportunities for leveraging new capabilities that can improve the overall user experience and system efficiency.

By configuring ClassicUI initially, the organization can maintain a semblance of familiarity for users who have been accustomed to the existing interface. This transitional approach allows for a smoother adjustment period for both users and developers, minimizing disruptions that could arise from a sudden shift to a completely new user interface.

Creating a new project focused on the Touch UI during the transition allows for adopting a modern and responsive design incrementally, aligning with more up-to-date web practices. This phased strategy can help manage costs and resources effectively, enabling the team to ensure that the new Touch UI is well integrated and tested before fully switching over.

This option also avoids the significant risk and potential expenses that could come with remaining on an outdated platform or rushing