I notice that it is possible to define prerequisites between packages using Metacello. However, I have not found a way to specify prerequisites directly in packages themselves. Is it correct that there is no mechanism available for defining prerequisites on Pharo packages? Are there any projects that will try to address the lack of prerequisite information on packages? Will for example âRingâ include this? I have made a tool for visualizing dependencies between VisualWorks packages. In VisualWorks the prerequisite information is found directly at instances of classes representing package versions (PackageModel). The tool mixes visualization of the defined/specified prerequisites and computed/calculated prerequisites. I think I once read about a tool for Pharo to compute/calculate prerequisites. Does anyone know which tool this is? Information about my VisualWorks dependency tools can be found here: http://blog.epigent.com/2012/03/analyze-dependencies-in-visualworks.html I am using Pharo 1.4 together with the Nautilus browser. Kind regards Runar Jordahl