Present the background information before the formal introduction of the paper. Including more material is better than leaving material out. Create a title page and a short 100 to 150 word abstract before the introduction. An abstract is a short summary and can include general information about the results of the lab experiment. Titles should usually be less than 10 words and must be informative. Your teacher should know what the report is about by reading the title.
Write the formal introduction section of the report. Begin with a heading labeled "Introduction." A good introduction addresses a few key points, including the significance of the study, previous knowledge or research regarding the topic and the purpose of the study. Explicitly state your hypothesis in the purpose section of the introduction.
Write a major section titled "Materials and Methods." Include information about what materials were used, how the materials were used, and where and when the study was conducted. Think of this section as a procedural manual and include any information another scientist needs to know to replicate the actions you took to complete the study.
Create a "Results" section. Include the section heading and write the results of your study, being as objective as possible. Describe the results without discussing any implications or significance of them. That will be discussed in the following section.
Close the lab report with a "Discussion and Conclusion" section in which you restate the important results and focus on interpretation of those results. Speculate or explain any interesting trends in the results. Finally, state ways the study could be improved or suggest future studies to further investigate the research topic.