An assertion says something is so. Evidence shows why. A strong sustainability answer states its point, gives a figure or observation that supports it, and adds a sentence that links the two.
This lesson is part of SPM subjects and learning resources. Once you can separate the two, comparing design choices with explicit criteria becomes easier.
How can I spot an assertion in my own writing?
Ask: could a reader check this from what I wrote on the page? If the sentence relies on the reader simply agreeing, it is an assertion.
Signs include words like obviously, clearly, everyone knows and better, used without a comparison or a number.
Worked example: a school canteen
An original scenario. A school canteen gives out disposable cups with drinks. The prefects want to argue for a reusable-bottle scheme.
Assertion only. “Reusable bottles are better for the environment.”
Step 1, add a figure. “The canteen counted 300 disposable cups in one school day.”
Step 2, scale it. “Over a five-day week that is 300 × 5 = 1 500 cups.”
Step 3, say where the evidence comes from. “The count was taken by two prefects at the collection bin on one ordinary day.”
Step 4, link to the point. “A reusable bottle replaces these single-use cups for the student who brings one, so fewer cups enter the bin. One day’s count is a small sample, so the prefects should repeat it on other days.”
The final version is a short paragraph. The point is the same as before, but now the reader can see the number, where it came from and a limit.
The mistake to avoid
A common slip is to add a figure and stop. “300 cups are used” is evidence, but it only becomes support when a sentence says what the number shows.
The repair is the link sentence: “This matters because each cup is used once and then thrown away.” Always ask, so what does this number show?
Check yourself
Improve this paragraph: “Solar panels are the best choice for the school roof. Everyone knows they are cleaner.”
Use these original details: the school’s electricity bill averages RM2 400 each month, and a supplier’s quotation says a panel set could reduce the bill by RM600 each month.
Answer
A sample: “Solar panels could be a good choice for the school roof. The school’s electricity bill averages RM2 400 each month, and a supplier’s quotation states a reduction of RM600 each month. That is 600 ÷ 2 400 = 0.25, or 25% of the bill. The figure comes from a quotation, so it should be checked against the school’s real roof area and sunlight before deciding.”
Notice that “best” and “everyone knows” are removed. The claim is now hedged, the numbers are checked (600 ÷ 2 400 = 0.25), and the source and its limit are named.
What to study next
Apply the same habit across questions in the original Sustainability practice set. Then read comparing design choices with explicit criteria to learn how evidence is weighed. The structured-answer self-review tool helps you mark each sentence as assertion or evidence.
For a teacher who can question your claims and help you back them up, see online one-to-one Sustainability tuition.