Title of paper: From the Archives of the Formal Methods and Tools Lab: Axiomatising and Contextualising ACTL


We present a sound and complete axiomatisation of ACTL, an action-based version of the well-known branching-time temporal logic CTL, and place it into a historical context. ACTL was originally introduced by Rocco De Nicola together with Frits Vaandrager 30 years ago, and it has played a major role in shaping the activity of our Formal Methods and Tools Lab from the nineties to this very day.