Discussing the con-troversial aspects helps to identify the main gaps that need to be worked upon.

Use the attached source to wirte 2 LITERATURE REVIEW. ( The problem statment is on : Heat Exchanger realiblity and predective maintenance
The main purpose of the review is to introduce the readers to the need for conducting the said re-search. A literature review should begin with a thorough literature search using the main keywords in relevant online databases. Once all the relevant literature has been gathered, it should be organized as follows:
− Background literature about the broad research topic to introduce the readers to the field of study.
− Recent progress on the study topic which can be organized thematically or chronologically. Ideally, separate themes should be discussed in a chronological manner to describe how research in the field has evolved over time and to highlight the progress in the field.
− The review should include a comparison and contrast of different studies. Discussing the con-troversial aspects helps to identify the main gaps that need to be worked upon. This is essential for defining the problem statement of the study and highlighting the significance of the research under question.
− Once a problem statement has been defined, the strengths and pitfalls of other studies that have tackled the problem statement should be discussed. This is important for outlining the need and novelty of the research.