INSTRUCTIONS

Step1

Repeat your original hypothesis in the first part of the conclusion. Also reiterate the aspects of your Introduction to refresh the reader's memory of what you set about to prove with your testing and research.

Step2

Mention which studies were relevant to your conclusion and which studies you felt offered little or no helpful results. Account for all your data, even if you conclude that the result of individual testing does not affect your hypothesis.

Step3

Explain why your study is important to the reader. This can be the most difficult part of formulating your conclusion. You must instill in the reader a sense of relevance. This can work whether or not you proved your hypothesis. Link your conclusion to human need on some level.

Step4

Detail the implications of your study in the world of science. Cite existing scientific studies that helped your choose your tests and explain how your study will impact future scientific studies. After acceptance and publication, future doctoral students will use your dissertation as a reference point in their own research.

Step5

Strive for accuracy and originality in your conclusion. If your hypothesis is similar to previous papers, you must establish why your study and your results are original. In addition, check and double-check your figures and data because the dissertation committee will. Accuracy is imperative.

Step6

Conclude with how your testing supports or disproves your hypothesis. By the time you reach the end of your conclusion, there should be no question in the reader's mind as to the veracity of your claims.

Source: http://www.ehow.com/how_4617129_write-scientific-conclusion-dissertation.html

Avoid:

• Ending with a rephrased thesis statement that contains no substantive changes.

   

• Introducing a new idea or subtopic (although you may end with a provocative question; see below).

   

• Focusing on a minor point in the essay.

   

• Concluding with a sentence tacked on to your final point.

   

• Apologizing for your view by saying such things as "I may not be an expert" or "At least this is my opinion."
• Attempting to make up for an incomplete structure. (If you say you will discuss four books, attempt a complete discussion of two books, do not try to cover the remaining texts in a concluding paragraph. In such a situation, it's best to limit your paper to topics you can realistically cover.)

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IF YOU'RE CONFUSED, CHECK THE SUMMARY OF SECTIONS BELOW:

Introduction--Give background, significance, previous work, and explain what you're investigating. 
Methods--Describe exactly what you did and how.
Results--Describe what happened, what you found.
Discussion--Explain. Tell what the results mean or indicate; point out individual things that might have been interesting; suggest possible explanations and perhaps even future experiments. 
Conclusion--This can often feel like a summary of the discussion. Do say whether your results support or contradict your hypothesis, give the significance of this for the field, perhaps briefly point toward the next step.