Data items tend to be like children: They enjoy hanging around together. Often, you’ll see the same three or four data items together in lots of places: as fields in a couple of classes, as parameters in many method signatures. Bunches of data that hang around together really ought to find a home together. The first step is to look for where the clumps appear as fields. Use Extract Class (182) on the fields to turn the clumps into an object. Then turn your attention to method signatures using Introduce Parameter Object (140) or Preserve Whole Object (319) to slim them down. The immediate
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