  We evolve a methodology and define a metric to evaluate Tactile Internet
based Cyber-Physical Systems or Tactile Cyber-Physical Systems (TCPS). Towards
this goal, we adopt the step response analysis, a well-known control-theoretic
method. The adoption includes replacing the human operator (or master) with a
controller with known characteristics and analyzing its response to slave side
step disturbances. The resulting step response curves demonstrate that the
\textit{Quality of Control} (QoC) metric is sensitive to control loop
instabilities and serves as a good indicator of cybersickness experienced by
human operators. We demonstrate the efficacy of the proposed methodology and
metric through experiments on a TCPS testbed. The experiments include assessing
the suitability of several access technologies, intercontinental links, network
topologies, network traffic conditions and testbed configurations. Further, we
validate our claim of using QoC to predict and quantify cybersickness through
experiments on a teleoperation setup built using Mininet and VREP.
