^ MooseModel root entityStorage at: systemName ifAbsent: [
model := MooseModel new.
model name: systemName.
importer := MooseSqueakClassPackageImporterTask new.
importer importingContext mergeClassAndMetaclass.
importer runCandidateOperator.
importer model: model;
addFromPackagesNamed: (MooseScripts packageNamesFor: systemName, '*') ;
addFromPackagesNamed: (MooseScripts packageNamesFor: 'ConfigurationOf', systemName);
runWithProgress.
^ model install
].