The Roman Numerals in the Introduction need to be I, II, III, IV and not i, ii, iii, iv as that is the 3rd level of subdivision.
Missing the Header “Body”
In the Body, it should be I, II, III and not 1, 2, 3.
The second level of subdivision is Capital letters and should be A, B and not a, b….throughout the outline.
The Conclusion should be I, II and not 1, 2