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A1.11 · Communicate procedures, results, and conclusions clearly

Learn to communicate procedures, results, and conclusions clearly through clear examples and targeted practice.

Ontario Grade 12 Biology

Scientific Investigation Skills and Career Exploration

Procedures, results, and conclusions in SBI4U

In SBI3U, you investigated living systems and learned to record observations. In Grade 12, the quality of an investigation also depends on how clearly you communicate what you did, what you found, and what the evidence supports. Imagine testing whether light level affects the growth of seedlings. A reader needs enough information to understand the setup, interpret the measurements, and judge whether the conclusion follows from them. Clear communication does not make weak evidence stronger. It makes the evidence and its limits easier to assess.

What you will learn

Distinguish a procedure, a result, and a conclusion.
Write a procedure that another student could follow.
Present results with clear labels, units, and appropriate detail.
Connect a conclusion to evidence and state a limitation without overclaiming.

From a question to a clear procedure

A procedure is an ordered account of how an investigation was carried out. It should give enough detail for another person to repeat the investigation in a similar way. Include the materials or biological samples that matter, the steps taken, what was changed or measured, and how measurements were made.

An independent variable is the factor deliberately changed. A dependent variable is the factor measured in response. These terms help a reader see what the investigation compares. For example, in a seedling investigation, light level could be the independent variable and seedling height the dependent variable.

A fair comparison also requires relevant conditions to be kept consistent. If seedlings in different light conditions receive different amounts of water, then water could also affect their growth. State important controls, such as the type of seedling, container, water amount, and measurement schedule. Do not add details that were not actually part of the investigation.

Use numbered steps or short paragraphs in time order. Name quantities and units, such as millilitres of water or centimetres of height. Replace vague directions like “leave it for a while” with the actual time used. If a detail was not recorded, do not invent it to make the procedure appear complete.

Describe what was done, not what should have been done.
State the factor changed, the factor measured, and important conditions kept consistent.
Use enough detail for a reader to understand or repeat the procedure.

Results: show observations before interpreting them

Results are the observations and measurements collected during an investigation. They are not explanations of why a pattern occurred. A results section can use sentences, a table, or a graph. Choose a format that makes the comparison easy to see.

Every table or graph needs a clear title and labels. Give measured quantities with units. In a graph, label both axes and show the units for measured values. Include the groups or conditions being compared. If you report an average, state what was averaged and how many measurements contributed to it.

For instance, a results sentence could say, “After seven days, the seedlings in the brighter location had a greater mean height than those in the dimmer location.” This reports a comparison. It does not claim that light alone caused the difference. The reader still needs the actual measurements or a labelled display to judge the size and consistency of the pattern.

Be accurate about the source of the information. If values are invented for practice, identify them as hypothetical. Do not present them as observations from a real investigation. If measurements vary, show that variation where the chosen format allows it rather than hiding it.

Keep results separate from explanations.
Label quantities, units, groups, and time points.
Present the measurements honestly, including variation that matters.

Conclusions: connect evidence to the question

A conclusion answers the investigation question using the results as evidence. A strong conclusion names the observed pattern, points to relevant measurements, and explains how far the evidence supports the answer. It does not simply repeat the procedure or say that the prediction was correct.

Use careful wording. If one group has a larger measured value, you can report that difference. A claim that the changed factor caused the difference needs a procedure that makes the comparison fair and evidence that supports that interpretation. One classroom investigation may support a limited conclusion about the samples and conditions tested; it may not establish what happens in every organism or setting.

A limitation is a feature of the investigation that may affect how confidently the results answer the question. Examples include few samples, inconsistent measurement, or conditions that were not kept the same. Name a limitation that is relevant to the evidence. Then explain how it could affect the interpretation. If proposing an improvement, make it address that limitation.

A simple planning frame is: “Under the conditions tested, [pattern] was observed. The measurements show [specific evidence]. This supports [carefully limited answer]. However, [relevant limitation] means [effect on confidence or interpretation].” Fill the frame with information from the actual investigation, not assumptions.

Answer the question and cite specific results.
Separate an observed pattern from a claim about its cause.
State relevant uncertainty and keep the conclusion within the evidence.

A communication check before sharing

Before submitting a report or presenting findings, check that a reader can follow the investigation from start to finish. Can the reader identify what was changed and measured? Are the procedure steps in order? Can the reader tell what each number means? Does the conclusion point to results rather than to expectation or opinion?

A useful final check is to compare each conclusion statement with the evidence beside it. If the evidence shows only a difference between two tested groups, do not write a broader claim than that comparison supports. If a method detail is missing, acknowledge the gap rather than filling it in from memory or guesswork.

Check clarity, accuracy, labels, and consistency across the whole report.
Make each conclusion statement traceable to reported evidence.
Acknowledge missing information instead of presenting a guess as fact.

What belongs in each part of a biological investigation report

Part	Main purpose	Useful details
Procedure	Explain what was done	Ordered steps, materials that matter, conditions, measurements, units, and timing
Results	Show what was observed or measured	Values, labels, units, groups, time points, and relevant variation
Conclusion	Answer the question using evidence	Observed pattern, specific supporting results, limits, and relevant uncertainty

Worked example

Example 1: Improve a procedure

A student writes, “We put plants in different light and checked how they did.” Identify what is unclear and rewrite the procedure details that would be needed. Do not invent details that the student has not supplied.

Find the missing information
The sentence does not say which plants were used, how the light conditions differed, how long the test lasted, or what “checked how they did” means. It also gives no measurement schedule or units.
Specify what a repeatable account needs
The student should report the actual plant type and number, how each light condition was set, what other conditions were kept consistent, and how growth was measured. The student should include the timing and units used.
Avoid filling gaps with guesses
A suitable revision cannot supply unknown facts. The student should return to their records and write the real steps. If a detail was not recorded, they should state that the procedure record is incomplete rather than inventing a value.

Answer: The original procedure is too vague to repeat. A complete revision must use the student’s actual records to identify the plants, light conditions, duration, measurement method, schedule, units, and important conditions kept consistent.

Check: The revision adds the information needed to understand the method without pretending that missing details are known.

Worked example

Example 2: Separate results from a conclusion

For practice only, consider hypothetical seedling heights after seven days: the dimmer-location group measured 4 cm, 5 cm, and 5 cm; the brighter-location group measured 6 cm, 7 cm, and 8 cm. Write a results statement and a cautious conclusion.

Describe the measurements
The dimmer-location measurements range from 4 cm to 5 cm. The brighter-location measurements range from 6 cm to 8 cm. State these as hypothetical values because they were supplied for practice, not collected as real observations.
Check the comparison
Every listed height in the brighter-location group is greater than every listed height in the dimmer-location group. This supports a clear description of a difference in these example measurements.
Limit the conclusion
A conclusion can say that the brighter-location group had greater measured heights in this hypothetical example. It should not claim that light alone caused the difference, because the problem gives no information about whether other conditions were controlled.

Answer: Results: In the hypothetical data, heights were 4–5 cm in the dimmer-location group and 6–8 cm in the brighter-location group after seven days. Conclusion: The brighter-location group had greater measured heights in these example values. The information provided does not establish that light alone caused the difference.

Check: The results report the values; the conclusion interprets their pattern and states the limit of the available information.

Worked example

Example 3: Match a conclusion to its evidence

A student measures leaf length once in each of two classroom plant groups. The first group has a mean of 8 cm and the second a mean of 10 cm. The student writes, “The treatment always makes leaves grow longer in all plants.” Revise the claim and identify one useful limitation.

Compare claim with evidence
The evidence describes two group means: 8 cm and 10 cm. It supports reporting that the second group had a greater mean in this measurement. It does not demonstrate what happens in all plants or under every condition.
Revise the conclusion
Use wording that names the tested groups and the measured difference. Avoid “always” and “all plants,” because those words extend beyond the evidence described.
Name a limitation
Only one measurement is reported for each group. Without information about the number of plants or the spread of their measurements, it is difficult to judge how representative the means are. A useful report should state what was actually measured and acknowledge this missing detail.

Answer: A more careful conclusion is: “The second group had a greater mean leaf length than the first group in the measurements reported, 10 cm compared with 8 cm.” A relevant limitation is that the number of plants and the range of measurements are not given, so the reader cannot assess how well the means represent each group.

Check: The revised conclusion reports the comparison without claiming a universal effect.

Common mistakes and how to avoid them

Writing a procedure as a broad summary, such as “we tested the plants.”

Correction: Give the actual steps, conditions, measurement method, timing, and units needed to understand or repeat the work.

Explaining a cause in the results section.

Correction: Report observations and measurements first. Discuss what they may mean in the conclusion, with appropriate limits.

Claiming that one comparison proves a result applies to every organism.

Correction: Limit the conclusion to the samples and conditions described, and identify evidence that is missing.

Adding details that were not recorded so a report sounds complete.

Correction: Use actual records. Identify gaps honestly rather than inventing procedure details or results.

Lesson summary

A procedure explains what was done in enough detail to understand or repeat it.
Results present observations and measurements with clear labels and units.
A conclusion answers the question and points to evidence.
A careful conclusion does not go beyond the samples, conditions, or measurements described.
Limitations and missing information should be stated clearly.

Check your understanding

Question 1

Which sentence belongs most clearly in a results section?

The brighter-location group had heights of 6 cm, 7 cm, and 8 cm.
The brighter location caused every seedling to grow faster.
The seedlings were placed under different conditions to test growth.
The results may be limited because only a few measurements were taken.

Show answer and explanation

The brighter-location group had heights of 6 cm, 7 cm, and 8 cm.

It reports measurements. The second sentence makes a broad causal claim, the third describes a procedure, and the fourth discusses a limitation.

Question 2

A procedure says, “Measure growth regularly.” What would most improve its clarity?

Give the actual measurement schedule and units used.
Add a conclusion about which group should grow most.
Replace the measurement with a general observation.
State that the results prove the prediction.

Show answer and explanation

Give the actual measurement schedule and units used.

A specific schedule and units help the reader understand what was measured and when. The other choices do not clarify the procedure.

Question 3

Two groups have reported mean leaf lengths of 8 cm and 10 cm. Which conclusion is best supported by this information alone?

The group with a mean of 10 cm had a greater reported mean in this comparison.
The treatment always increases leaf length in all plants.
The treatment caused the difference, regardless of other conditions.
Every individual leaf in the second group was longer.

Show answer and explanation

The group with a mean of 10 cm had a greater reported mean in this comparison.

The two means support a comparison of reported group means. They do not establish a universal effect, prove a cause, or show that every individual measurement followed the same pattern.

Key terms

Procedure: An ordered account of how an investigation was carried out.
Independent variable: The factor deliberately changed in an investigation.
Dependent variable: The factor measured to see how it changes with the investigation conditions.
Results: The observations and measurements collected in an investigation.
Conclusion: An answer to an investigation question that is supported by the reported evidence.
Limitation: A feature or gap that may affect how confidently results answer the question.

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About this lesson and its review

Published by DoAssignment. This reviewed lesson follows Ontario Grade 12 Biology (SBI4U), expectation A1.11. It is a study resource, not an official curriculum publication.

Before publication, content is checked for structure, mathematical or chemical notation, calculations, course boundaries, and readability. Errors can still occur, so corrections are welcomed.

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