Your proposal is actually your first draft of Chapter 1. You will write the final draft of Chapter 1 after you finish writing other chapters. The structure for Chapter 1 is:
1.1 Background
1.2 Research objectives
1.3 Research questions
1.4 Significance of the study
1.5 Scopes and limitations
1.6 Research methodology
1.7 Thesis outline
1.8 Summary
