What does a lab report look like? A laboratory report has a very clear and predictable structure, made up of a number of major stages.
Why does it look this way? The stages in the report and their sequence have developed in this way to accurately recount a scientific activity and to interpret the results of this activity. In this way scientific knowledge is developed out of scientific experimentation. In an engineering report, the wider significance of this direct scientific knowledge (in economic, social and/or environmental terms) is explored.
In what order should I write the report? The order in which you write the stages will probably not be the same order in which they appear in the report. Many engineers recommend writing the results first, followed by the discussion, conclusions, introduction, summary and other minor stages.

Note: In a first year course, you will probably not be asked to write a complete laboratory report. You may only be asked to write the Results and Discussion section or you may be asked to write your report in a group, in which case you will need to allocate different parts of the report writing to different group members. However in later undergraduate years, you will be expected to write a full report.

TITLE to tell the reader the topic of your report
SUMMARY (ABSTRACT) to provide a summary of the whole report
INTRODUCTION to give enough background information to readers so they will know the context and purpose of your experiment
METHODS to tell the reader what you did, the materials you used, the procedure you followed
RESULTS to tell the reader what you found
DISCUSSION to interpret and explain the significance of what you found
CONCLUSION (optional) to summarise your findings and interpretations
REFERENCES to tell the reader the origin of all the references you have cited in the text
APPENDIX(-CES) (optional) to give more detailed information

Howard and Tim explain about what they are looking for when marking a report
(1m 12s):

Howard and Tim advise students about planning their writing better, especially for a group report (1m 6s):

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