We address three questions raised by Cummings and Foreman regarding a model of Gitik and Sharon. We first analyze the PCF-theoretic structure of the Gitik---Sharon model, determining the extent of good and bad scales. We then classify the bad points of the bad scales existing in both the Gitik---Sharon model and other models containing bad scales. Finally, we investigate the ideal of subsets of singular cardinals of countable cofinality carrying good scales.
['Chris Lambie-Hanson']
Good and bad points in scales