The introduction includes a focus on the importance of all the elements to be studied and is considered as a justification and a prelude to the research objectives
It does not much matter what you call it. The first chapter can explain the background behind the topic of research, what is known, what is yet to be discovered and why you are doing this research. It can lay out succinctly what the objectives are and what each of the following chapters are going to cover in a methodical fashion
introduction in the thesis is important because it illustrates the problem that will be studied and the purpose of the study and clarify important things to study in other sense is the introduction of the main focus on which the assumptions are based.
Some theses are devoted to questions - the solution of which results from the whole previous development of research in this field; therefore the first chapter begins with the introduction (with a description of the state of research achieved to this point)
Theses devoted to the development of a new direction of science; either those theses which provokes numerous discussions of the subject under consideration - require the beginning of the first chapter with the author's rationale - explaining his own position.
I prefere and vote for the introduction rather than the rational as with an introduction will have an abvious insight into the thesis and what is the importance of topic.
I agree with José Luis García Vigil. It is unto the preference of the author. A rationale for research is a set of reasons offered by a researcher for conducting more research into a particular subject -- either library research, descriptive research, or experimental research.
Normally the first chapter is Introduction in any dissertation or thesis. Under the Introduction the scholar introduces the topic of his/her research and he/she has to invariably show where the gap in research exists. Thus rationale or purpose of the research has to be justified in the 'introduction' and the same is substantiated in the chapter of ' Literature overview'
Thus the intention of the research scholar is to bring to the notice logically as to how his research is different from other scholars in the same area. Then his duty is to further prove by referring to each paper published by other authors in the same area of research how his proposed work is different. This part is covered under Literature overview.
It is therefore justified to write briefly the rationale of the proposed work in the first chapter "Introduction" itself.
If the research scholar thinks it proper to write the rationale in detail he/she may do the same under separate chapter, " Rationale for the proposed research" but in the introduction he/she must briefly justify the need of proposed research work .
I am agreed with Dr. Piotr T. Nowakowski' answer. This depends on the philosophy of thesis structure and organisations. Besides, it depends on the Universities' requirements in writing their theses and dissertations While in some universities, they make a free choice for the Supervisor and the candidate to do their theses structures and outlines in the way they like.
The introduction addresses a brief description of the theses or dissertations through its outline, purpose of the study with an attempt to get reader's attention, literature review that related with topic. While rationale is simply explains the reasoning behind the choice of topic. It proves to readers the importance of the topic chosen. Therefore, rationale of theses (or dissertations) is a part of introduction.
What you pose is a frequent occurrence in the practice of research.
Adopting one way or another, for me, has no consequences in the final result, therefore, neither in the fulfillment of the objective foreseen for the investigation. It is, rather, a matter of habit suggested by the evaluators.
From the methodological point of view, there is nothing solid that contradicts the author's choice, in one way or another.
Authors should feel free to adopt diverse methodological formats, provided that the format adopted is scientifically well structured.
The evaluative subjectivity to which the theses are subject, on the part of the bodies of evaluators, is what causes the unnecessary abortion of a methodological course previously chosen by the student.
If the chosen format is structurally appropriate and comfortable for the student because it imposes another standard?
Certain positions of intransigence are not always pedagogically edifying.