First of all, we are going to fix the term ‘the dissertation acknowledgements’. So, the dissertation acknowledgements are such a part of the dissertation, which allows the dissertation’s author to express his/her gratitude to people who are considered to have been helping him/her while he or she was writing the dissertation.
 
Writing the dissertation acknowledgements is not necessary. To put it another way, the part of the dissertation, which is called ‘the dissertation acknowledgements’, is optional. If a person wants to thank someone who supported him or her during the period of his/her dissertation writing, he/she may express the gratitude in the dissertation acknowledgements. If one supposes nobody to have been helping, he/she may avoid writing the dissertation acknowledgements.
 
However, there is one case, when the dissertation acknowledgements writing becomes necessary. For example, if you have received some scholarship or grant in order to help you to conduct your dissertation research, you become obliged to write the dissertation acknowledgements. In this case, in your dissertation acknowledgements you will thank those people, or the organization, or whatever it is, for their support of your dissertation research.
 
While writing the dissertation acknowledgements, you should use informal and simple language. Try to glean the words which will reflect your sincerity and thankfulness to those who supported you. Do not forget, that the dissertation acknowledgements will not be evaluated, as the whole dissertation paper. The dissertation acknowledgements writing is aimed to appeal to people, who supported you, show that you remember it, admit that their support was really important for you. It will be really pleasant for them to find out that you remember them.