How to Write a Practical Report at O-Level: Structure, Templates, and Worked Example

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Study guide21 Mar 2026, 00:00 Z

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TL;DR
O-Level practical reports in Singapore follow a specific structure that is different from university lab reports. The exam paper itself guides the structure (you fill in tables, draw graphs, and answer questions), but you still need to know the conventions for each section. This guide covers every section from raw data to evaluation, with templates and a worked example.

O-Level practical reports vs university lab reports

If you search "how to write a lab report" online, you will find university-level guides from Monash, Adelaide, and Toronto. These are not what you need. O-Level practical reports differ in several important ways:

Feature	O-Level practical (Paper 3/5)	University lab report
Format	Fill in a structured answer booklet provided by SEAB	Write a full report from scratch
Introduction/hypothesis	Not required (the question provides the context)	Required (you write your own)
Method	Follow the instructions in the question paper	Design and write your own method
Data recording	Fill in tables with pre-printed headers or draw your own	Create tables from scratch
Graph	Draw on the grid provided in the booklet

Reviewed by

Marcus Pang·Managing Director (Maths)

Trial	Length / cm	Time for 20 oscillations / s
1	30.0	22.06
2	30.0	21.94
3	40.0	25.38
4	40.0	25.42

Length / cm	Mean time for 20 oscillations / s	Period T / s	T² / s²
30.0	22.00	1.10	1.21
40.0	25.40	1.27	1.61

Source of error	Effect on results	Improvement
Reaction time when starting/stopping the stopwatch manually	Period measurements may be too high or too low by up to 0.3 s	Use a light gate and datalogger to measure the period electronically
The pendulum did not swing in a single plane	Effective length varied during oscillations, making period inconsistent	Use a fiducial marker and ensure the bob swings in a single plane
Heat loss from the beaker surface (for thermal experiments)	Final temperature is lower than expected, reducing calculated energy	Insulate the beaker with cotton wool or use a polystyrene cup

Report section	SEAB strand	What the examiner checks
Setting up and taking readings	MMO	Did you handle apparatus correctly and read instruments to the right precision?
Raw data table	MMO + PDO	Are units in headers, decimal places consistent, repeat readings taken?
Processed data table	PDO	Are calculations correct, headers labelled, significant figures appropriate?
Graph	PDO	Scale, labels, plotting accuracy, best-fit line, gradient calculation
Conclusion	ACE	Does the conclusion reference specific data values and link to the relationship?
Evaluation	ACE	Are sources of error specific and are improvements matched to each error?

Length L / cm	Time for 20 oscillations (Trial 1) / s	Time for 20 oscillations (Trial 2) / s	Mean time for 20 oscillations / s
20.0	18.12	18.06	18.09
30.0	22.06	21.94	22.00
40.0	25.38	25.42	25.40
50.0	28.50	28.44	28.47
60.0	31.12	31.18	31.15

How to Write a Practical Report at O-Level: Structure, Templates, and Worked Example

O-Level practical reports vs university lab reports

Sources

The six sections of a practical report

Section 1: Raw data table (MMO marks)

Section 2: Processed data table (PDO marks)

Section 3: Graph (PDO marks)

Section 4: Calculations (PDO/ACE marks)

Section 5: Conclusion (ACE marks)

Section 6: Evaluation (ACE marks)

How MMO, PDO, and ACE map onto report sections

Worked example: simple pendulum experiment

Five mistakes that cost the most marks

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Sources

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