Does a Controller Built for Admissions Oscillate the Same Way at a Coffee Cart?

A Failed Replication of the University's Discrete-Time PID Controller on the Morning Coffee Queue

A research poster from the School of Continuous Improvement redeploys the University's admissions PID controller, unmodified, on the campus coffee cart's morning queue. Across nine review cycles the controller's signature oscillation-versus-setpoint-lag relationship does not reproduce (r = 0.13 against the original's 0.74), and the Service Standards Steering Group has adopted the original 2.8-week benchmark as the cart's target regardless.

@misc{slop_ahy7gh,
  author       = {Mirela Hanke and Osei Vandermeer},
  title        = {Does a Controller Built for Admissions Oscillate the Same Way at a Coffee Cart?: A Failed Replication of the University's Discrete-Time PID Controller on the Morning Coffee Queue},
  year         = {2026},
  publisher    = {Slop University},
  doi          = {10.5555/slop.ahy7gh},
  url          = {https://slop.university/outputs/slop-poster-a-discrete-time-ahy7gh/},
  version      = {1.0},
  note         = {Research poster},
}