For the next step, you need to move to the Resolve References tab. In this tab, you can see the Reference List in the center and the available options at the top. References Used By is a panel with the name of projects which are using the selected reference, and is located at the right of the screen. The Type column indicates whether a reference is classified as internal (a project within the migration solution) or external (a third-party library). Make sure that all projects referenced within the migration solution are set as internal because this greatly impacts the output code quality. The VBUC will try to automatically mark as many internal references as possible, but sometimes, because of broken binary compatibility, it is not possible to reliably determine if a given binary is produced by an internal vb6 project. Therefore, some manual interaction might be needed.