Explain cause-effect and compare-contrast relationships

Informational writers organize their ideas using text structures that signal relationships between ideas. Two of the most powerful structures are cause-effect and compare-contrast. Knowing how to use both — and when to choose each — makes your informational writing clearer, more logical, and more persuasive.

Cause-Effect Structure

A cause-effect structure explains why something happened (cause) and what resulted from it (effect). Writers use this structure to explain scientific processes, historical events, social changes, and natural phenomena.

• Cause = the reason or trigger — the event or condition that makes something happen.
• Effect = the result or consequence — what happens because of the cause.
• One cause can have multiple effects, and one effect can have multiple causes.
• Cause-effect paragraphs often move from cause to effect, but can also start with the effect and work back to the cause.

Signal Words for Cause-Effect

• Cause signals: because, since, due to, as a result of, owing to
• Effect signals: therefore, thus, so, as a result, consequently, this led to, which caused
• Combined: if … then, whenever … then

Compare-Contrast Structure

A compare-contrast structure shows how two or more subjects are alike (comparison) and how they are different (contrast). This structure helps readers understand both subjects more deeply by placing them side by side.

• Similarity = what the two subjects share in common.
• Difference = what makes each subject unique.
• Block structure: describe all of subject A, then all of subject B.
• Point-by-point structure: compare one feature at a time across both subjects.

Signal Words for Compare-Contrast

• Similarity signals: both, similarly, likewise, in the same way, also, just like
• Contrast signals: however, but, whereas, on the other hand, in contrast, unlike, while