This talk will outline the Surfliner code base, describe the GitLab monolithic source repository, and discuss the reasons behind choosing this model of source control management. It will include background on the systems and workflows used by the UC San Diego and UC Santa Barbara teams that make managing and working productively with a single repository feasible, in addition to a psychomachia-style discussion of the advantages and trade-offs of this approach. The 'Related URL' below links to a video recording of the session. The video has closed captioning. and A presentation given at Samvera Connect 2020 On-line described thus