Task:  Healthy Beat Ltd. is a medical device firm to develop and manufacture heart-rate monitors. Recently the top management team has decided to implement a MES(Manufacturing Execution System) software solution to vastly enhance its production line efficiency and reduce production leadtime.  The supplier of this MES software solution is called Quick Link. 
Issue 3: Your team member from production department is very key for the success of the project.  He needs to coordinate the requirement collections, facilitate hardware/software installation and testing etc.  However, he is also a busy person and has limited time with your project. This will delay your project schedule by 1 month without his full-time support. 
这种情况涉及哪些主要的利益相关者？