Which of the Following Is a Method for Tracking and Contacting

Multiple Choice

Which of the following is a method for tracking and contacting hidden and oppressed populations to retain their ongoing participation in longitudinal research studies include:

A) Identify as many anchor points as possible.
B) Make repeated reminder calls to anchor points in advance of scheduled sessions.
C) Use mail tracking.
D) Ask service providers or other community agencies whether they have been in recent contact with participants whom you are unable to locate.
E) Talk with people on the streets about where to find particular participants
F) All of these.