Consider you have been appointed as UX$/$UI to design a Virtual Reality Game for cancer patients. As a designer, you need to identify user requirements and problems in their daily life. You also have to meet the Physician $($medical specialist$)$ to gather information regarding the specific interventions $($treatment$)$ and the Psychology researcher to seek their advice in designing the interface.

$($a$)$ Explain $2$ methods to collect requirements from users.

$($b$)$ Apply $4$ level attributes in the direct manipulation system to enhance interaction for cancer patients using the application.

$($c$)$ Describe $5$ features of $3$D interfaces as an intervention for treating cancer patients.

$($d$)$ Based on this situation, choose ONE suitable expert review method and describe the steps in conducting expert reviews for Virtual Reality Games for cancer patients.

$($e$)$ Provide $2$ examples of interventions that can be embedded in the games to treat cancer patients.