How to structure of a Ph.D. sandwich thesis? I would like to know the main structure of this kind of thesis.

Although some guidelines can be taken from this post, additional details would be appreciated.

When building the introduction, I feel quite collapsed trying to join and describe all the aspects of the 3 published articles I have. This will be also the same for the final discussion. In fact, it makes me feel that I'm repeating myself what I've already written in the papers. I like DRY principle.

Thanks! Here is a preliminary outline:


TABLE OF CONTENTS
ACKNOWLEDGEMENTS
LIST OF ABBREVIATIONS USED
SUMMARY
INTRODUCTION
HYPOTHESIS AND OBJECTIVES
MATERIALS AND METHODS
RESULTS
Paper1
Paper2
Paper3
DISCUSSION
CONCLUSIONS
REFERENCES
ANNEXES
This is the structure that worked for me and number of my friends throughout western European universities: 

Title: A title that reflects your contributions/publications. 

Table of contents

ACKNOWLEDGEMENTS 

ABBREVIATIONS 

Abstract 

INTRODUCTION 

Note on Introduction: Most important of all is to highlight what you want to answer in your research. Also the problem/motivation should be discussed here. 

Paper1 ... PaperN

Note On Paper-Based Chapters: The order of them are very important. Order them based on the content not the year of the publication. 

Evaluation: In this chapter put both the discussion and results. Try to figure out the benefits and shortcomings of your research.

CONCLUSIONS and Future Work: conclude based on your contribution and highlight the future work. 

REFERENCES

Note: Not so many students take time on organizing their references' style. Most of them just copy/paste the Bibtex code and don't look if all their references obey the same style rules. 

ANNEXES