The word 'gerund' is going out of favour, with ' -ing verb form ' now preferred; the result, however, is the same: a gerund is an -ing verb form used as a noun. In your initial sentence, communicating effectively and anticipating customer needs are nonfinite clauses acting as nouns (in this case, the sentence's compound subject): this makes their heads, the -ing verb forms, gerunds-- so the gerunds are communicating and anticipating . Communicating effectively and anticipating customer needs are gerundival clauses , or just ' -ing clauses'.
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