Comparing two similar products
Design & Technology · Key Stage 2 · The School
The same criteria for both
Comparing two products fairly means judging both against the exact same list. Price, weight, how easy it is to use, how long it lasts. Judging one on price and the other on looks is not a real comparison. It is just two separate opinions. Writing the list down first stops it changing halfway through.
Testing both the same way
Say you test how waterproof one product is, by pouring water on it. Test the other one the exact same way. Same amount of water. Same time. Same surface. Testing them differently makes the results impossible to compare honestly, however careful each single test was. Changing even one small thing between tests can make the whole comparison meaningless.
Which suits this user?
It is rare for one product to simply be better at everything. One might be cheaper but heavier. The other might be lighter but cost more. The real answer depends on the user. A cheaper, heavier bag suits someone on a budget. A lighter, dearer one suits someone walking far.
BOTTLE A: metal, 300g, holds 500ml, £12. BOTTLE B: plastic, 120g, holds 500ml, £4. Both are tested the same way: dropped from the same height, onto the same floor. Bottle A survives with a dent. Bottle B cracks. For a school trip on a tight budget, B might still win on price. For a building site, where it gets dropped often, A wins despite costing more. Same two products, same fair tests — a different winner for a different user.