Will engagement survey results change if a manager or direct report is changed?

Results of an engagement survey are tied to the department/manager and location. Up until the start date of the survey period, this will be dynamic. So if you create a survey for the period of January 20-January 30 and you had 10 direct reports, those 10 people would receive a notification of the survey. If you had an additional 5 people report to you beginning January 15, they would then also be invited to participate in the survey with your existing 10 reports. 

However, beginning on the start date of the survey period, the survey will become static. So if you had an additional 5 people begin reporting to you on January 20, they would not be invited to participate in the survey and the survey results would reflect when you had 15 direct reports.