The phrase "is included in" can be substituted with different synonyms to avoid repetition and add variety to your writing. Some synonyms for "is included in" include "forms part of," "belongs to," "comprises," "constitutes," "incorporates," "encompasses," "entails," and "contains." For instance, one may use "this chapter comprises a review of the literature," or "this section incorporates recent research findings." An example of "entails" in a sentence is "performing well in this role entails excellent communication skills." Whatever synonym employed, it is essential to use them appropriately in the context to maintain coherence in your writing.