Using Data and Evidence in Speeches

Data Is Ammunition, Not the Argument

The most common mistake delegates make with data is treating it as the argument itself. They list statistics one after another — GDP figures, death tolls, percentage changes — as if the numbers speak for themselves. They do not. Data is ammunition that supports an argument, but the argument must come first.

Consider the difference:

Data as argument (weak): 'Climate change affects 3.6 billion people. Temperatures have risen 1.1 degrees since pre-industrial levels. Sea levels have risen 20 centimeters. Arctic ice has decreased by 13 percent per decade.'

Data supporting an argument (strong): 'This committee has a choice between prevention and reaction. Prevention costs money — but the World Bank estimates that climate inaction will push 132 million people into extreme poverty by 2030. That is the cost of doing nothing. Our delegation argues that the investment in prevention is not optional — it is the most cost-effective path available.'

The first version gives the audience four numbers to process and no reason to care about any of them. The second gives one number, embedded in a clear argument with a clear implication.

Selecting the Right Data

You will find hundreds of potentially relevant statistics during research. The challenge is choosing the right ones. Effective data selection follows three rules:

1. One number per point. Each argument in your speech should be supported by a single, well-chosen statistic — not a barrage. If you are arguing that peacekeeping is cost-effective, choose the single most compelling figure: 'Every dollar invested in peacekeeping saves sixteen dollars in post-conflict costs.' Done. One number, clearly sourced, directly supporting your point.

2. Round for impact, cite for precision. In spoken delivery, say 'nearly 70 million displaced people' rather than '68.5 million.' Round numbers are easier to absorb and remember. But have the precise figure ready if challenged.

3. Comparisons beat absolutes. '$4.2 billion' means nothing to most audiences. '$4.2 billion — more than the entire GDP of Liberia' creates scale. 'A 40 percent increase' is vague. 'Doubled in the last decade, from 34 million to 68 million' creates trajectory. Always contextualize your numbers.

Delivering Data for Maximum Impact

How you say a number matters as much as the number itself:

• Slow down before the number. If you are speaking at normal pace and suddenly say '132 million people,' it blurs past. Slow down, add a micro-pause before the number, and deliver it with emphasis: 'current policies will push... one hundred and thirty-two million people... into extreme poverty.'
• Repeat once for emphasis. 'Sixteen to one. For every dollar invested in peacekeeping, sixteen dollars saved in reconstruction. Sixteen to one.' Repetition cements the figure.
• Look up from your notes. When you deliver a key statistic, make eye contact with the room. Data delivered to a page has no impact. Data delivered to people's eyes does.
• Connect it immediately. Never end on a number — always end on what it means. 'That is not a statistic. That is a policy failure this committee has the power to reverse.'