A Guide to Writing an Engineering Laboratory (Lab) Report
Department of Engineering
Faculty of Engineering and Science,
University Tunku Abdul Rahman (UTAR)
Laboratory (Lab) reports are the most frequent document written by engineering student. These reports can contribute a significant amount of marks and yet little time or attention is devoted in understanding on how to write them well. The aim of this document is to provide a general guideline on writing a lab report.
A lab report should not be used to merely record the expected and observed results but demonstrate the writer’s comprehension of the concept behind the data. A good lab report should address the following questions:
• “Why?” – Why did I do this particular experiment? • “How?” – How did I actually carry it out?
• “What?” – What did I find? What were my results? • “So What?” – What does my result mean? What is the significance of the result? What are my conclusions?
2. Typical sections in a report
2.1 The Title Page
This is the most important section of the report because it provides information about the name of the experiment, author, and date. The title should be straightforward, and contain no more than 15 words.
2.2 The Abstract
This is a brief summary of the report. It gives the reader a quick idea of what you did, the main results, and their significances.
2.3 The Introduction
The introduction sections in a report states the objectives of the experiments and provide the reader with the background to the experiment. In addition, a good introduction also provides the reader with justification for why the work was carried out. And some further information of the theoretical principle involved in the experiments. Students should take note on VERB TENSE. These two points should help you in writing the introduction section.
• By the time you get to the stage of writing a lab report, the experiment is already finished. Use past tense when talking about the experiment.
“The objective of the experiment was………..”
• The report, the theory and permanent equipment still exist; therefore, these get the present tense:
“The objective of this report is………..”
“Newton’s Law of motion is………….”
“The transmission electron microscope produces micrographs………”
2.4 Materials (or Equipment)
This can be a simple list with short description of the equipment used in the experiments.
2.5 Experimental Procedure
Explain how you actually carried out the experiment in chronological order. Using clear paragraph structure, explain all steps in order they actually happened. If you have documented the right procedures involved in conducting your experiment, hence, another colleague should be able to duplicate your experiment.
The results section consists of calculations, graphs and tables. But student must use the calculations, graphs and tables to explain the results from their experiment. On a further note, the graphical representation (graphs and tables) must be clearly labeled.
Example, Figure 1: Effect of X on Y
This is usually considered the most important part of the lab report. In this section, students are required to show an understanding of the experiment. This part of the lab focuses on question of understanding. The flow chart in figure 1 can be used as a guideline by student to write the discussion section in their lab report. [pic]
Figure 1: Guidelines for discussion of experimental results 
Other strategies you can use in your discussion are:
• Compare expected results with those obtained.
• Analyse experimental error.
• Explain your results in terms of theoretical issues. • Relate results to your experimental objectives.
• Compare your results to similar investigations.
In most undergraduate laboratory report, the conclusion can be very short....
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