This document provides requirements for developing graphical user interfaces (GUIs) using the Qt framework and EPICS channel access (CA) at the Australian Synchrotron. It specifies that GUIs shall interface with EPICS and be built within the Australian Synchrotron's formal build system. It also provides requirements for integrated development environments, operators, and common Qt widgets that interface with EPICS CA. The goal is to establish standards for cross-platform GUI development across the accelerator and beamlines using Qt/C++.