For our May presentation, Stephane Ducasse will present the vision behind Pharo and how that is been implemented incrementally across multiple releases. In Stef's words: "The vision of Pharo is based on three pillars: - First we want to make sure that Pharo is used to develop complex and robust systems (by complex we means multiple millions lines of code or objects). - Second we want Pharo to be a modular system that can be versatile (Pharo on iot, on large servers, in the web browser….) - Third Pharo should be an evolvable system that can adapt to new needs (modular tools, first class slot, new debuggers, packages…). Sometimes it can be unclear that we follow this vision but over the years we are delivering this vision and we will continue. In this talk I will briefly recall the vision behind Pharo and show the achievements so far. I will show that our development is heavily backed by tests. In the second part of the talk I will focus on the current effort to improve the user interface. I will show that the reimplementation of the Spec UI framework is a cornerstone of the future replacement of Morphic and use of GTK. I will also answer questions about Pharo 11 and Pharo 12." Stephane is an Inria Research Director, currently lead the RMoD team ( http://rmod.lille.inria.fr/ ). Stef is an expert in language design, software quality, program understanding, program visualisations, reengineering and metamodeling. Among his contributions we can list: traits (implemented in Pharo, Perl, PHP and other languages); Moose, an open-source software analysis platform ( http://www.moosetechnology.org/ ). Stef is one of the leaders of Pharo ( http://www.pharo.org/ ), a dynamic reflective object-oriented language supporting live programming, and of the industrial Pharo consortium ( https://consortium.pharo.org/ ). Stef works regularly with companies such as Thales, Wordline, Siemens, Berger-Levrault, Arolla, and others on their software evolution problems. Stef has authored a couple hundred articles ( http://stephane.ducasse.free.fr/Publications.html ) and several books ( http://books.pharo.org/ ). This will be an online meeting from home. If you'd like to join us, please sign up in advance on the meeting's Meetup page ( https://www.meetup.com/ukstug/events/293473947/ ) to receive the meeting details.