Manage and coordinate your team. It doesn't matter whether it's internal or external, because quality assurance affects everyone.
Invite your team members to work together in 4-check. This way you avoid interfaces and can communicate more easily.
By assigning different authorizations, you can also integrate your external partners. This enables you to assign, monitor and control tasks externally.
A very detailed authorization system allows you to decide which user can view which data and make settings.