Introduction should hook the reader to the passage. It may ask a question from the reader which the reader may not be able to answer as this would require introspection and analysis. Introduction can also include statistical figures
Body should contain the main analysis involving statistical figures and reasoning. It is the main part of the pssage and may be 5  - 6 times the introduction and conclusion in terms of the number of words used
Conclusion should highlight the learning or the summary of the facts stated in the body