A thesis proposal is a paper informing on the major issues of your thesis. Thesis proposal is turned in to your tutor for him/her to get to know about your thesis in general. Thesis proposal is written on a separate paper and is not included into your thesis. It is a kind of a draft of your thesis which may be used during your thesis presentation as well.
 
Proceeding to writing a theses proposal you should remember that you should tell briefly about the purposes of your thesis topic research and importance of your thesis topic investigation. It should be informative enough for the tutor to catch the idea of your future project and its parts. Writing a thesis proposal is possible if you have made up a plan of your thesis beforehand.
 
Writing a thesis proposal: TIPS

• Writing thesis proposal: Introduction

Proceeding to writing a thesis proposal introduction you should remember that it should inform on the purposes of your investigation, the methods you are applying to, the subject and objects of your investigation and the expected results;

• Writing thesis proposal: the Main Body

Your thesis proposal body gives the general information about the research procedure and the way you will be conducting experiments. These are the 2 major issues presenting the process of your future investigation which are essential to mention about while writing a thesis proposal;

• Writing theses proposal: Conclusion

Writing thesis proposals conclusion it is advisable to mention about the expected positive results of your investigation and the way you will manage to achieve them. You must also present the possibility of failure and the possible way of preventing it.

As far as you can see, there is a certain necessity in writing thesis proposals because of the 2 factors: 1) your tutor will or will not allow you to conduct research the way you want; 2) you may resort to your thesis proposal during the presentation.