  Many professional services are provided through text and voice systems, from
voice calls over the internet to messaging and emails. There is a growing need
for both individuals and organizations to understand these online conversations
better and find actionable insights. One method that allows the user to explore
insights is to build intuitive and rich visualizations that illustrate the
content of the conversation. In this paper, we present a systematic survey of
the various methods of visualizing a conversation and research papers involving
interactive visualizations and human participants. Findings from the survey
show that there have been attempts to visualize most, if not all, of the types
of conversation that are taking place digitally, from speech to messages and
emails. Through this survey, we make two contributions. One, we summarize the
current practices in the domain of visualizing dyadic conversations. Two, we
provide suggestions for future dialogue visualization research.
