Establishing and Maintaining a Main Idea
Objective 0007 is the one of the heaviest multiple-choice objectives on the Writing subtest, accounting for 14 to 16 questions. These items hand you a thesis, a topic sentence, or a short paragraph and ask you to judge whether ideas are focused, ordered, and connected. Your job is to recognize what holds a piece of writing together and what pulls it apart.
Learning Outcomes
After studying this section, you will be able to:
- Identify effective thesis statements and topic sentences and reject weak ones
- Spot information, statements, or details that detract from the development of a main idea
- Recognize ineffective repetition and redundancy
- Reorganize sentences or paragraphs to achieve a logical sequence of ideas
- Identify effective transitions from one paragraph to another
(1) THESIS STATEMENTS AND TOPIC SENTENCES
(A) The Controlling Idea
Thesis Statement vs. Topic Sentence
A thesis statement is the single sentence that announces the central claim of an entire essay and previews the direction the writing will take. A topic sentence is the sentence that states the main idea of a single paragraph and ties that paragraph back to the thesis. Both must be arguable or focused enough to be developed; a statement of plain fact ("Schools have libraries") cannot be a thesis because there is nothing to develop.
- Scope match: A good thesis is broad enough to cover the whole essay but narrow enough to be proven. "Education is important" is too broad; "Year-round schooling improves student retention" is the right size.
- Specificity: Effective topic sentences make a claim ("Recess raises classroom focus"), not an announcement ("This paragraph is about recess").
- Singularity: A topic sentence carries one controlling idea. If it forecasts two unrelated points, the paragraph will wander.
On the Exam: You will see four candidate thesis or topic sentences and be asked which is most effective. Eliminate any option that is a bare fact, a question, or an announcement ("In this essay I will discuss..."). The correct answer makes a focused, arguable claim that matches the scope of the writing described in the stem.
"Many cities are removing public benches. This essay talks about benches. Cities should keep public benches because they support the elderly, give tired pedestrians rest, and strengthen the sense of a shared downtown."
How to apply the skill: The second sentence, "This essay talks about benches," is an announcement, not a claim, so it fails as a thesis. The third sentence is the real thesis: the word "should" signals an arguable position, and the three reasons ("support the elderly," "give tired pedestrians rest," "strengthen the sense of a shared downtown") preview the body paragraphs. On the exam, the strongest thesis is the one carrying both a position word and a preview of the support.
⚠ COMMON TRAP: Test writers plant a sentence that is detailed and grammatically polished but is only a fact, such as "The first public benches appeared in Paris in 1860." It reads smart, so candidates pick it. A fact cannot be a thesis because it leaves nothing to argue or develop. Always test the candidate sentence with one question: "Could someone reasonably disagree, or could this be developed across paragraphs?" If no, it is not the thesis.
(2) UNITY: DETAILS THAT DETRACT
(A) Relevance to the Controlling Idea
Identifying the Irrelevant Sentence
Unity means every sentence in a paragraph supports its topic sentence; a sentence that detracts introduces information that, however true or interesting, does not advance the main idea. The detracting sentence often shifts to a side topic, a personal aside, or a different time frame than the rest of the paragraph.
- Off-topic shift: A sentence about a related but separate subject (cost, when the paragraph is about safety).
- Wrong level of generality: A sweeping claim dropped into a paragraph built on one narrow example.
- Tone break: An opinionated or casual remark inside an otherwise factual paragraph.
On the Exam: The stem numbers each sentence and asks which one should be deleted because it detracts from the main idea. Find the topic sentence first, state its controlling idea in your own head, then test each numbered sentence against it. The answer is the sentence that does not serve that idea, even if it is factually true.
"(1) Community gardens improve neighborhood health in measurable ways. (2) Residents who tend plots eat more fresh vegetables and report lower stress. (3) Studies link gardening to reduced blood pressure. (4) My grandmother grew tomatoes that won a county fair ribbon. (5) Even short weekly sessions in a garden produce these benefits."
How to apply the skill: The controlling idea in sentence (1) is that gardens "improve neighborhood health." Sentences (2), (3), and (5) all give health evidence. Sentence (4), "My grandmother grew tomatoes that won a county fair ribbon," is a charming aside about a prize, not about health, so it detracts and should be deleted. Notice it is perfectly true; relevance, not truth, is the test.
(3) REPETITION AND REDUNDANCY
(A) Cutting Wordiness That Adds Nothing
Ineffective Repetition vs. Purposeful Repetition
Redundancy is the use of words that repeat meaning already present, and ineffective repetition is restating the same idea without adding information. Concise writing states an idea once with full force; the exam rewards the version that says the same thing in fewer words without losing meaning.
Redundant (error)
"The two committees collaborated together to combine and merge their separate, individual plans into one final end result."
Concise (corrected)
"The two committees merged their plans into one result."
- Built-in redundancy: "collaborated together," "combine and merge," "final end result" each pair words that already mean each other.
- Purposeful repetition is allowed: repeating a key term for emphasis or to keep a thread clear is not an error; only meaningless duplication is.
On the Exam: You will choose the most concise version of an underlined phrase. The longest option is almost never correct. Watch for classic redundant pairs: "free gift," "past history," "advance planning," "basic fundamentals," "unexpected surprise." The right answer keeps the meaning and drops the duplicate.
(4) LOGICAL SEQUENCE AND REORGANIZATION
(A) Ordering Sentences and Paragraphs
Finding the Correct Sequence
Logical sequence is the arrangement of sentences or paragraphs so that each idea follows naturally from the one before it. Coherent writing usually opens with a general statement, moves through development, and closes with a result or conclusion; chronological steps and cause-then-effect chains follow the same forward logic.
- Find the orienting sentence: the sentence that introduces the subject with no backward reference belongs first.
- Follow pronoun and reference chains: a sentence beginning "This change" must come after the sentence that names the change.
- Use signal words: "first," "then," "as a result," and "finally" lock sentences into order.
On the Exam: Sentences are scrambled and numbered, and you choose the most logical order. Lock down the opening sentence first (it stands alone with no "this," "therefore," or "such"), then trace each transition word and pronoun to chain the rest. Eliminate any order that places a "this" or "as a result" sentence before its trigger.
Key Insight: A sentence that begins with a back-reference ("As a result," "This policy," "Such concerns") can never be first. Locating the one sentence with no back-reference identifies the opener in seconds and collapses the answer choices fast.
(5) TRANSITIONS BETWEEN PARAGRAPHS
(A) Choosing the Transition That Matches the Relationship
Matching the Connector to the Logic
A transition is a word or phrase that signals the relationship between one idea and the next, guiding the reader from paragraph to paragraph. The correct transition is the one whose meaning matches the actual logical relationship between the two ideas; a contrast idea needs a contrast word, and a result idea needs a result word.
On the Exam: A blank sits between two paragraphs and you select the transition. Read the idea before the blank and the idea after it, decide the relationship (does the second add, contrast, or conclude?), then pick the matching word. The trap answer is a real transition that signals the wrong relationship, such as "however" placed where the ideas actually agree.
"The new bus route cut average commute times by fifteen minutes and pleased downtown workers. ______, ridership in the outer neighborhoods fell because the route no longer stopped there."
How to apply the skill: The first idea is a benefit; the second idea is a drawback, so the relationship is contrast. "However" or "In contrast" fits. An addition word like "Furthermore" would be wrong because the second sentence does not add more good news; it pushes against the first. Always name the relationship before choosing.
⚠ COMMON TRAP: Candidates pick a transition by how smooth it sounds rather than by logic. "Therefore" and "however" both glide nicely off the tongue, so test writers offer both. Smoothness is not the test; the relationship is. If the second idea is a consequence of the first, only a result word works, no matter how natural a contrast word sounds.
CHAPTER SUMMARY
There were 5 Learning Outcomes for this lesson. I have restated each one and provided a Test Ready Tip.
-
Identify effective thesis statements and topic sentences and reject weak ones.
This is the most tested skill in the objective. Memorize the three killers of a thesis: it is a bare fact, a question, or an announcement ("In this essay I will..."). The correct answer almost always makes an arguable claim with a position word like "should." -
Spot information, statements, or details that detract from the development of a main idea.
Drill the habit of stating the topic sentence's controlling idea before testing each numbered sentence. The detracting sentence is usually true but off-topic, so do not be fooled by accuracy. Relevance is the only test. -
Recognize ineffective repetition and redundancy.
Learn the stock redundant pairs ("end result," "free gift," "each and every"). On underline-the-phrase items the shortest correct-meaning option usually wins. Worth quick, confident points. -
Reorganize sentences or paragraphs to achieve a logical sequence of ideas.
Always find the opener first: it has no back-reference. Then chain "this," "such," and "as a result" sentences to their triggers. This single move eliminates most wrong orderings. -
Identify effective transitions from one paragraph to another.
Name the relationship (contrast, addition, result, example, sequence) before you look at the choices. Never pick by sound. The trap is a fluent transition signaling the wrong logic.
Quick Reference Card
- A thesis must be arguable or developable: reject bare facts, questions, and announcements ("This essay discusses...").
- A topic sentence states one controlling idea and ties its paragraph to the thesis.
- A detracting sentence is often true but off-topic; relevance, not truth, is the test for deletion.
- Redundancy repeats meaning: cut pairs like "end result," "each and every," "close proximity," "in order to."
- The opening sentence in a reordering item has no back-reference (no "this," "such," "as a result").
- Chain "this/such/therefore" sentences to the sentence that triggers them to lock down sequence.
- Pick transitions by logic, not sound: contrast (however), addition (furthermore), result (therefore), example (for instance), sequence (first/finally).