The Graphical Language Server Protocol (GLSP) is emerging as a standard for communication between web-based graphical modelling clients and model servers, with existing implementations in Java and TypeScript — but none in Smalltalk. This paper describes the design and implementation of GLOSS, a GLSP-compliant model server built in Pharo Smalltalk, and compares it to the authors' existing EVA graphical modelling environment. The result reveals both the advantages of Smalltalk's dynamic, object-oriented approach and a set of concrete limitations in the GLSP protocol itself.
Why Modelling Notations Fail — and How to Design Visual Languages That Actually Work
Graphical models are central to enterprise architecture and information systems work, yet they frequently fail to deliver value — not because the underlying analysis is wrong, but because the notations are poorly designed, mismatched to their audience, or unable to highlight what matters. This doctoral research paper sets out a programme of design science research aimed at improving visual language design and tooling, drawing on insights from human cognition, perception, semiotics, and graphic design. It introduces polymetric diagramming as a technique for making models more expressive and proposes a meta-meta model and tool architecture to support more effective visual language design and use.