  Assessing human performance in robotic scenarios such as those seen in
telepresence and teleoperation has always been a challenging task. With the
recent spike in mixed reality technologies and the subsequent focus by
researchers, new pathways have opened in elucidating human perception and
maximising overall immersion. Yet with the multitude of different assessment
methods in evaluating operator performance in virtual environments within the
field of HCI and HRI, inter-study comparability and transferability are
limited. In this short paper, we present a brief overview of existing methods
in assessing operator performance including subjective and objective approaches
while also attempting to capture future technical challenges and frontiers. The
ultimate goal is to assist and pinpoint readers towards potentially important
directions with the future hope of providing a unified immersion framework for
teleoperation and telepresence by standardizing a set of guidelines and
evaluation methods.
