There are many ways to categorize research reports, but here are some common classifications based on purpose, audience, and content:

By Purpose:

• Informative Reports: These reports aim to present factual information, research findings, and analysis of a particular topic. They are designed to educate the reader and provide a comprehensive understanding of the subject matter. (e.g., A report on the effectiveness of a new educational program)
• Analytical Reports:  These reports go beyond simply presenting information. They involve analyzing data, identifying trends or patterns, and drawing conclusions based on the evidence. They are used to support decision-making or problem-solving. (e.g., A report analyzing customer satisfaction data to identify areas for improvement)
• Persuasive Reports:  These reports aim to convince the reader of a particular viewpoint or recommendation. They often use data and evidence to support the argument but may also employ persuasive language and reasoning. (e.g., A report proposing a new marketing strategy for a company)

By Audience:

• Technical Reports: These reports are written for a specialized audience with a strong understanding of the technical jargon and concepts relevant to the field. They typically contain detailed information about research methods, data analysis, and results. (e.g., A report on a new scientific discovery written for other scientists)
• Popular Reports: These reports are written for a general audience and avoid overly technical language. They focus on presenting the key findings and implications of the research in a clear and concise way. (e.g., A report on the same scientific discovery written for a general news audience)
• Grant Proposals: These reports are designed to convince a funding agency to provide financial support for a research project. They outline the research question, methodology, and expected outcomes, along with a budget justification.

By Content:

• Literature Review Reports: These reports summarize and analyze existing research on a particular topic. They are valuable for understanding the current state of knowledge in a field and identifying research gaps.
• Feasibility Reports: These reports assess the feasibility of a proposed project, considering factors like cost, resources, and potential risks and benefits.
• Progress Reports: These reports track the progress of an ongoing research project or program. They typically outline what has been accomplished so far, any challenges encountered, and plans for the future.
• Evaluation Reports: These reports assess the effectiveness of a program, intervention, or product. They use data and analysis to determine if the objectives were met and if there are any areas for improvement.

Additional Types:

• Case Studies: These reports provide an in-depth analysis of a single case, program, or event. They are used to explore complex issues and gain insights that may be applicable to broader situations.
• White Papers: These reports present information or arguments on a particular topic from a specific viewpoint. They are often used by industry experts or companies to promote their ideas or products.

Remember, these categories are not mutually exclusive. A research report can possess elements of more than one type depending on its specific goals and audience.