Many weak speeches fail before the speaker says a word, because the speaker never decided exactly what the speech was for. They had a topic and a pile of material, but no target.
From topic to specific purpose
Start with a topic, then choose a general purpose: to inform, to persuade or to mark an occasion. Then narrow. A specific purpose states what you want the audience to know, believe or do by the end of the speech. Write it from the listener's side: "I want my audience to understand the three ways our city tests its drinking water," or "I want the council to vote to fund a crosswalk on Elm Street." A good specific purpose fits the time available. Five minutes is enough to explain how a jury is chosen, not the history of trial by jury.
The central idea
The specific purpose is your private goal; you may never say it aloud. The central idea, often called the thesis, sums up the speech's main message in one sentence, and you do say it. For the water talk it might be: "Our water is tested at the source, at the treatment plant and at the tap, and each test catches different problems." A useful check: if listeners remember only one sentence tomorrow, is this the sentence you want it to be?
Main points
The body of a speech is built from main points that each support the central idea. Most speeches work best with two to five main points. Fewer can feel thin; more become hard to follow by ear. Keep them roughly balanced in time, keep them distinct from one another, and, where you can, word them in parallel form so listeners can hear the pattern.
Patterns of organization
Several standard patterns help listeners follow along. Chronological order follows time, as in the steps of a process or the stages of a life. Spatial order follows physical layout, as in a tour of a building from the entrance to the back. Topical order divides a subject into categories, such as the economic, health and cultural effects of a policy. Cause and effect order explains why something happened or what it will lead to. Problem and solution order describes a problem, then proposes a fix, and is common in persuasive speeches. Level 7 adds a persuasive pattern built on this last one.
Introductions
An introduction has four jobs. It should gain attention, show why the topic matters to these listeners, establish your credibility, and preview the main points. Attention can come from a short story, a striking fact, a question or a quotation. Avoid opening with an apology for being nervous or unprepared; it invites the audience to watch for flaws.
Conclusions
A conclusion signals that the end is near, restates the central idea, and closes with something memorable: a return to the opening story, a call to action, a strong final line. A conclusion should not introduce new main points. Fresh material at that moment is wasted and can confuse.
Connectives
Because listeners cannot see paragraphs, speakers mark the structure out loud. Transitions link one idea to the next. Internal previews announce what is coming in a section, and internal summaries recap before moving on. Short phrases that flag a speaker's place, such as "my second reason" or "the key point is," are called signposts. They can feel obvious when you write them, but in a room they are a gift to the audience.
Outlines
Most teachers recommend two outlines. A preparation outline sets out the whole speech in full sentences so you can check its logic. A speaking outline uses brief key words and delivery cues, such as "pause" or "slow down," and is what you carry to the lectern.
Worked example: two hours and two minutes
On 19 November 1863, a cemetery for Union soldiers was dedicated at Gettysburg, Pennsylvania. The main speaker, Edward Everett, a famous orator, spoke for about two hours. President Abraham Lincoln followed with remarks of roughly 270 words, lasting about two minutes.
Lincoln's speech has a clear chronological structure. It begins in the past: "Four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal." It moves to the present: "Now we are engaged in a great civil war." And it ends in the future, with the hope that "this nation, under God, shall have a new birth of freedom."
His specific purpose, we might say, was to honor the dead and recommit the living. His central idea appears near the end: "It is for us the living, rather, to be dedicated here to the unfinished work which they who fought here have thus far so nobly advanced." Every sentence serves that idea. There are no detours.
Everett saw it at once. The next day he wrote to Lincoln: "I should be glad, if I could flatter myself that I came as near to the central idea of the occasion, in two hours, as you did in two minutes." Five handwritten copies of the address survive, and their wording differs slightly, so quotations vary by version.