I would like you to read the following article on Infrastructure.
The link for the article is here:
It can also be found in .pdf form at google scholar (as always)
Rinaldi, S. M., Peerenboom, J. P., & Kelly, T. K. (2001). Identifying, understanding, and analyzing critical infrastructure interdependencies. IEEE Control Systems, 21(6), 11-25.
The authors give a great synopsis. We will not only ask for a virtual visit, but will discuss it at length in prep for our mid term exam in week 4