"Taken from the humane assesment blog."

"Open a Transcript. Then open a playground, type this, execute and see the Transcript".
GLMCompositePresentation new
   with: [ :composite |
        composite rubricText
          onChangeOfPort: #text act: [ :textPresentation |
             Transcript cr; cr; show: textPresentation text ] ];
   openOn: 'Type something and check the Transcript'