Despite the large number of transformers available in FME, you will frequently find that a single transformer does not meet all your requirements. In this situation, you will need to use a combination of transformers. A string of joined transformers graphically represents your overall workflow and is a key concept of FME.
Above: In this example a DuplicateRemover transformer removes duplicate polygon features. A Dissolver transformer merges each remaining (unique) polygon with its neighbour where there is a common boundary. Finally each merged area gains an ID number from the Counter transformer.