This talk concerns measurement of software systems built as cyber-cyber digital twins. A cyber-cyber digital twin is a deployed software model that executes in tandem with the system it simulates, contributing to, and drawing from, that system’s behaviour. This talk outlines Facebook’s cyber-cyber digital twin, WW, a twin of Facebook’s WWW platform, built using Web-Enabled Simulation. The talk will focus on research challenges and opportunities in the area of measurement. Measurement challenges lie at the heart of modern simulation, directly impacting how we use simulation outcomes to make automated online and semi-automated offline decisions, and how we verify and validate those outcomes. As modern simulation systems increasingly become more like cyber-cyber digital twins, thereby moving from manual to automated decision making, these measurement challenges acquire ever greater significance.

This talk reports the results of joint work by John Ahlgren, Maria Eugenia Berezin, Kinga Bojarczuk, Sophia Drossopoulou, Elena Dulskyte, Inna Dvortsova, Johann George, Natalija Gucevska, Mark Harman, Ralf Laemmel, Maria Lomeli, Simon Lucas, Steve Omohundro, Erik Meijer, Rubmary Rojas, Silvia Sapora, Justin Spahr-Summers, and Jie Zhang.