The Importance of Previous Studies in the Thesis

Previous studies are one of the most important components of scientific theses, whether at the master’s or doctoral level, because they represent the foundation upon which the researcher builds their study, and provide them with a comprehensive scientific background about their research topic.
By reviewing previous studies, the researcher can understand what has already been accomplished in their field, and what aspects still need to be studied and developed, which ensures that their research provides a real scientific contribution rather than repeating what has been done before.
Mastering the writing of this section by the researcher reflects not only their effort in collecting information, but also indicates their ability to analyze, critique, and compare research studies, which gives the thesis academic depth and scientific credibility.
In this article, we will learn about the concept ofPrevious Studiesand their importance, and their scientific role in university theses, in addition to the correct way to write and analyze them in a systematic critical manner.

What Are Previous Studies?

Previous studies are a collection of scientific research papers or academic theses or peer-reviewed articles that address a topic similar to the current thesis.
The researcher reviews these studies with the aim of identifying what has been previously researched in their field, and what results other researchers have reached.
The role of previous studies is not limited to presenting information, but extends to analyzing, critiquing, and identifying scientific gaps that the current research will attempt to fill.
In other words, previous studies represent the researcher’s reference framework, as they connect them to the broader scientific context to which their research belongs.

The Difference Between Previous Studies and Theoretical References

Many beginner researchers confuse the concept of previous studies with theoretical references, despite the clear difference between them:

• Theoretical references: Include books and general sources that the researcher relies on to clarify concepts, terminology, and theories related to their topic.

• Previous studies: Are applied or academic research that has actually been conducted on a similar topic, and contain methodology, results, and analysis that can be compared with the researcher’s results.
  Therefore, previous studies represent the practical application of theory in a specific research context, while theoretical references are used to clarify the concept and intellectual framework of the research.

The Importance of Identifying Sources of Previous Studies

The importance of selecting sources for previous studies is no less than the importance of the studies themselves.
The researcher must rely on reliable and up-to-date scientific sources, published in peer-reviewed journals or recognized academic theses.
It is preferable to focus on studies published in the last five to ten years to ensure the information is current.
Tools that help the researcher access appropriate studies include:

• Academic databases such as Google Scholar, ResearchGate, and Scopus.

• Digital libraries of universities and research centers.

• Specialized scientific journals in the field of study.
  Selecting the right sources ensures that the researcher builds a strong knowledge base that enables them to discuss their ideas with confidence and objectivity.

The Scientific Role of Previous Studies in the Thesis

Previous studies are the cornerstone upon which scientific research is built, as they are not just a review of what has been written before, but an analytical tool that helps the researcher build their methodology and understand the general framework of their study topic.Here are the most prominent roles that previous studies play in academic theses:Building the theoretical foundation of the research
Previous studies provide the researcher with a knowledge base that enables them to form a comprehensive theoretical framework for their thesis.

By Reviewing What Has Been Written About the Concept or Phenomenon They Are Studying, the Researcher Can Identify the Theories or Scientific Models That Can Be Employed in Their Research, as Well as Become Aware of the Strengths and Weaknesses in Previous Applications.

For example, if a researcher is studying ‘motivation in the work environment’, reviewing previous studies helps them identify the most appropriate theory to explain organizational behavior, such as Maslow’s theory or Herzberg’s theory.
Avoiding scientific repetition
One of the most important goals of reviewing previous studies is to ensure the originality of the research, meaning that the thesis topic has not been researched in the same way or methodology before.

Reviewing Previous Studies Allows the Researcher to Know What Has Actually Been Accomplished in Their Field, Preventing Them from Re-studying Topics That Have Been Addressed Previously Without Offering Something New.

In this way, the academic institution ensures that the research contributes to enriching scientific knowledge rather than repeating it.
Identifying the research gap
By analyzing previous studies, the researcher can identify what is called the ‘research gap’, meaning aspects or angles that have not been addressed before.

For Example, a Researcher Might Discover That Most Previous Studies Focused on University Students, While They Did Not Address High School Students, or That They Studied the Relationship Between Only Two Variables Without Addressing a Third Important Variable.

Here, the need for a new research that addresses this deficiency becomes clear, giving the thesis real scientific importance and validity.
Supporting research hypotheses or questions
Previous studies help the researcher formulate accurate hypotheses and strong questions, based on previous scientific evidence.

By Reviewing the Results of Previous Research, the Researcher Can Predict the Relationship Between Variables in Their Current Study.

For example: if previous studies found that ‘motivation increases job satisfaction’, the current researcher can formulate a hypothesis stating:
There is a statistically significant relationship between motivation and the level of job satisfaction among employees in government institutions.
Thus, previous studies become scientific evidence that supports the logic of the new study.
How to write previous studies in the thesis
Writing previous studies in the thesis is not a process of transfer or summarization, but rather an analytical and critical presentation that highlights the extent of the researcher’s understanding of scientific sources and their ability to employ them intelligently.

Here Are the Basic Steps for Writing This Section Correctly and Systematically:

Step One: Searching for appropriate studiesStart by identifying keywords related to your topic, then use reliable academic databases such as Google Scholar, ResearchGate, or Scopus to find relevant studies.Ensure you select relatively recent studies (within the last five to ten years), and that they are published in peer-reviewed scientific journals or approved academic theses.
It is preferable to diversify sources to include both Arabic and international studies to expand the scope of analysis.

Step Two: Reading and Critically Analyzing Studies

Do not just read the abstract, but try to understand the methodology used, study objectives, data collection tools, results, and recommendations.
Ask yourself while reading questions such as:
What did this study add to scientific knowledge?

What Are Its Strengths and Weaknesses?

How can I benefit from it in my research?
This type of analysis shows the depth of the researcher’s understanding, and makes their presentation of previous studies more powerful and consistent.

• Step Three: Summarizing previous studies

• After reading the studies, write a brief summary of each that includes the following elements:

• Researcher’s name and year of publication.
  Study objectives, methodology, and tools.

Most Important Results It Reached.

The gap that the study did not cover and that your current research can address.

• Ensure the summary is in your own style, not copied verbatim, to avoid plagiarism.

• Step Four: Presenting previous studies in an organized manner

• Previous studies can be presented according to one of the following methods:

• By topic (theoretical axis): when studies address different subtopics within the general framework of the research.
  By methodology used: such as presenting quantitative studies first, then qualitative ones.

Chronologically: from Oldest to Newest to Show the Development in Research on the Topic.

The appropriate method depends on the nature of the thesis and the guidance of the academic supervisor.

• Methods for organizing and presenting previous studies

• Organizing previous studies is one of the most important steps that ensure the reader understands a sequential and interconnected development of knowledge about the research topic.

• The way the researcher arranges the studies is no less important than its content, because random presentation makes the text scattered and loses the methodological coherence of the thesis.
  Here are the most prominent methods for organizing previous studies in scientific theses:

Thematic Organization

This is the most common method in university theses.It involves classifying previous studies according to topics or sub-themes related to the thesis topic.For example, if the study addresses ‘motivation in the work environment’, studies can be organized into themes such as:
Material and moral motivation.
The relationship between motivation and productivity.

The Role of Leadership in Motivating Employees.

This organization allows the reader to understand the different aspects of the topic in a comprehensive and systematic manner.
Chronological Organization
In this pattern, previous studies are presented in chronological order from oldest to newest.

1. This method is used when the researcher wants to highlight the development of thought, theory, or methodologies over time.

2. For example, a researcher might start by presenting studies that addressed the topic in the 1990s, then move to studies from the last decade to clarify recent developments in the research field.

3. Methodological Organization
   This approach relies on classifying studies according to the methodologies used in them (quantitative – qualitative – mixed).

This Organization Is Very Useful in Studies That Are Interested in Comparing Research Methods, as It Allows the Researcher to Discuss Differences in Results Based on Methodological Differences.

For example, quantitative studies that used surveys and statistical analysis can be presented first, followed by qualitative studies that relied on interviews or content analysis.
The appropriate organizational method depends on the nature of the research and the researcher’s objective:
Thematic organization is suitable for theoretical research.

Chronological Organization Is Suitable for Historical or Developmental Research.

Methodological organization is suitable for comparative or analytical research.
Benefits of analyzing previous studies
Analyzing previous studies is not limited to summarizing them, but is a mental process aimed at forming a comprehensive critical vision for the researcher.

Here are the most prominent benefits that analyzing previous studies achieves in scientific theses:

• Developing a critical vision for the researcher

• Through analyzing previous studies, the researcher gains the skill of scientific evaluation, learning to distinguish between good and poor research, and determining the suitability of previous results for application in their current study.

• This analysis enhances the confidence of the examination committee that the researcher possesses a deep understanding of their topic.

Building Research Hypotheses and Objectives

When analyzing previous studies, the researcher can extract potential relationships between variables, helping them build logical, evidence-based hypotheses.
For example, if several studies indicate a relationship between ‘leadership style’ and ‘job satisfaction’, the researcher can build a hypothesis stating:

There Is a Significant Relationship Between Transformational Leadership and the Level of Job Satisfaction.

Supporting the results of the current research
Previous studies are also used after the completion of the research, as the researcher can compare their results with those of others, to clarify similarities or differences.

This Helps in Interpreting the Results in Greater Depth and Proving Their Credibility, as Well as Showing the Researcher’s Familiarity With the Complete Scientific Context of the Topic.

Common mistakes in writing previous studies
Despite the importance of this section in scientific theses, many researchers fall into methodological errors that weaken the quality of their study.
Here are the most prominent of these mistakes with clarification on how to avoid them:

Descriptive Narration Without Analysis

Some researchers limit themselves to presenting previous studies descriptively, that is, mentioning the study title and results only without analysis or discussion.
This approach makes the previous studies section resemble ‘repeated summaries’, and does not show the researcher’s analytical effort.

Solution: the Researcher Should Discuss Similarities and Differences Between Studies, and Link Them to Their Research Problem.

Reliance on unreliable or outdated sources
A common mistake is using non-peer-reviewed studies or those published on non-scientific websites, or relying on outdated sources that have lost their timeliness value.

Solution: the Researcher Must Adhere to Using Reliable and Up-to-date Scientific Sources (within the Last 5 to 10 Years).

Lack of connection between studies and the research topic
Some researchers make the mistake of including studies that are not directly related to the thesis topic, which shows weak methodological direction.
Solution: The researcher should only select studies directly related to their research problem, and clearly highlight how they support their topic.

Confusing Theoretical References With Previous Studies

A distinction must be made between theoretical sources that explain concepts, and previous studies that provide data and research results.
Solution: the researcher should allocate a separate section for each in their thesis, to avoid repetition or confusion in the presentation.

How to Analyze Previous Studies Critically

Critically analyzing previous studies is what distinguishes the professional researcher from the beginner.
Critical analysis does not mean criticizing previous researchers, but rather evaluating their work scientifically and methodologically, and clarifying how their results can contribute to developing the current research.

Here Are the Basic Steps for Effective Critical Analysis:

Comparing methodologies and tools used
Start by comparing the methodologies used in previous studies.

Did They Rely on Quantitative or Qualitative Methodology? Were the Tools Used (questionnaires, Interviews, Experiments) Appropriate?

This analysis clarifies the extent to which the methodology used is consistent with the nature of the research problem, and helps the researcher choose the optimal approach for their study.
For example:
If you find that most previous studies used a quantitative methodology to measure the relationship between variables, while some qualitative aspects remain unexplored, your qualitative study might be an important addition to the scientific field.

Evaluating Results and Conclusions

The researcher should not be satisfied with just presenting the results of previous studies, but should evaluate them.
Ask yourself:
Were the results consistent with the hypotheses?

Did the study face limitations or weaknesses?
Do these results align with the general trend of other research?

Through This Analysis, You Can Conclude the Reliability of Previous Results, and the Possibility of Relying on Them to Support Your Study.

Extracting the scientific gap
The most important step is to identify what previous studies have not addressed.

• The gap could be in the methodology, the target population, or in one of the variables that previous research overlooked.

• For example:

• If previous studies addressed the effect of motivation on performance in the private sector only, your study could focus on the public sector to fill this gap.

Identifying the scientific gap is what gives your research scientific originality and real value in your academic field.

The Relationship Between Previous Studies and the Theoretical Framework

The relationship between previous studies and the theoretical framework is an integrated one that cannot be separated.
The theoretical framework represents the conceptual and theoretical base that explains the phenomenon, while previous studies represent the practical applications of this theory.
Previous studies help the researcher in:
Choosing the appropriate theory for their research based on what others have used from theoretical models.
Clarifying theoretical gaps that have not yet been covered, which helps in developing the theoretical framework.

Connecting the Current Research to the General Scientific Context by Showing How the New Study Integrates Within Previous Studies.

For example, if the theoretical framework in your research is based on ‘Social Learning Theory’, the previous studies you used will clarify how this theory has been practically applied in similar studies.
Thus, the theoretical framework and previous studies are two sides of the same coin: the former provides theoretical explanation, while the latter provides practical evidence.

Conclusion

1. In conclusion, it can be said that previous studies represent the backbone of any successful scientific thesis.

2. They place the researcher within the scientific framework of their topic, reveal to them what has been accomplished and what has not yet been accomplished, and help them build strong hypotheses and precise methodology.

3. Dealing with previous studies with the mindset of a critical rather than a copying researcher is what makes the difference between an ordinary research and a pioneering one.

Therefore, ensure you read previous studies deeply, understand them, and analyze them with a critical scientific spirit that contributes to developing knowledge and offering something new.
Frequently Asked Questions (FAQs)

1. What Is the Appropriate Number of Previous Studies in the Thesis?

The number varies depending on the specialization, but it usually ranges between 15 to 30 studies at the master’s level, and may be more in doctoral studies. The most important thing is the quality of the studies, not their number.
2. Should I summarize each study separately?
Not necessarily. You can summarize studies by themes or topics, focusing on the essential points in each group of studies.
3. How do I know if previous studies are recent and reliable?

Check the Publication Date (preferably Within the Last 5 to 10 Years) and Whether They Are Published in Peer-reviewed Scientific Journals or Recognized Universities.

4. Can I use foreign studies in my thesis?
Yes, and this is preferable, as foreign studies often provide new insights and diverse experiences that can be compared with the local context.

5. What is the difference between the theoretical framework and previous studies?
The theoretical framework provides the concepts and theories that the research relies on, while previous studies address the applications of those theories and previous research results related to the topic.

3. How do I know if previous studies are recent and reliable?
Check the publication date (preferably within the last 5 to 10 years) and whether they are published in peer-reviewed scientific journals or recognized universities.

4. Can I use foreign studies in my thesis?
Yes, and this is preferable, as foreign studies often provide new insights and diverse experiences that can be compared with the local context.

5. What is the difference between the theoretical framework and previous studies?
The theoretical framework provides the concepts and theories that the research relies on, while previous studies address the applications of those theories and previous research results related to the topic.