  Sonalysts is working on an initiative to expand our current expertise in
teaming to Human-Artificial Intelligence (AI) teams by developing original
research in this area. To provide a foundation for that research, Sonalysts is
investigating the development of a Synthetic Task Environment (STE). In a
previous report, we documented the findings of a recent outreach effort in
which we asked military Subject Matter Experts (SMEs) and other researchers in
the Human-AI teaming domain to identify the qualities that they most valued in
a testbed. A surprising finding from that outreach was that several respondents
recommended that our team look into existing human-AI teaming testbeds, rather
than creating something new. Based on that recommendation, we conducted a
systematic investigation of the associated landscape. In this report, we
describe the results of that investigation. Building on the survey results, we
developed testbed evaluation criteria, identified potential testbeds, and
conducted qualitative and quantitative evaluations of candidate testbeds. The
evaluation process led to five candidate testbeds for the research team to
consider. In the coming months, we will assess the viability of the various
alternatives and begin to execute our program of research.
