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The Australian Electoral Commission has just published the 鈥測es鈥� and 鈥渘o鈥� pamphlets for the Indigenous Voice to Parliament referendum.

So who is the target audience for each case, what are their key messages, and how effective will they be?

I research how people and organisations use communication to effect change via, for example, entertainment or political advertising. When I look at the 鈥測es鈥� and 鈥渘o鈥� case pamphlets, there are aspects of each that stand out.

The 鈥測es鈥� pamphlet leans on the value of expertise to help voters decide. We hear from a senator and elder, a school principal, a filmmaker, the co-chair of the Uluru Dialogues, a former High Court Chief Justice, a professor, three former sports professionals, and numerous members of the Order of Australia. Moreover, many are recognisable names, such as Rachel Perkins, Patrick Dodson, and Eddie Betts.

The members of parliament who wrote the 鈥測es鈥� case consider these experts to have more experience with Indigenous affairs than most voters, and are better informed about it. Their likeability and familiarity also helps put the point across to readers in a more compelling way.

The key strategy of the 鈥渘o鈥� pamphlet, on the other hand, is 鈥渕ore is better鈥�. It outlines 10 reasons to vote 鈥渘o鈥�. This is a powerful approach because the subject lends itself to it 鈥� that is, the referendum is one a reasonable number of voters really want to think about, and many have concerns about.

In general, persuasive power increases when more reasons are provided. It seems that, according to the MPs who wrote the 鈥渘o鈥� case: 鈥渢he more facts you tell, the more you sell鈥�.

Like the 鈥測es鈥� case, the 鈥渘o鈥� case substitutes the real question voters are being posed with another, more straightforward one. So, voters will ask themselves if the experts possess the expertise needed to provide the advice to vote 鈥測es鈥�. And on the other hand, voters will ask themselves if the number of reasons provided to vote 鈥測es鈥� is high enough and compelling enough.

Whichever has the most rational and emotional pull for each reader will win their vote.

According to聽, expertise is the principal attribute of credibility. Understanding a subject and knowing what you are doing 鈥� that is, competence 鈥� enhances your credibility.

This means that if voters have the feeling a person possesses information and experience that they lack, then that expert鈥檚 viewpoint can be highly persuasive. In other words, expertise can feel like authority. This is especially so when information is hard to understand.

聽illustrates this nicely. Participants were asked to give their verdict in a mock trial. The case concerned a company suspected of having exposed its workforce to carcinogenic chemicals.

One of the witnesses was an expert, Professor Thomas Fallon. In one version of the trial, he explained in clear language that the chemicals concerned did indeed cause cancer. In another, he used incomprehensible jargon to say the same thing.

In this case, where the arguments put forward were difficult to understand, it was his expertise as a professor that proved decisive. The 鈥渏urors鈥� understood little of the actual evidence, but felt that if a professor said it was true, then it must be true.

It is hardly surprising, then, that experts are used in the 鈥測es鈥� case.

聽that the 鈥渕ore-is-better鈥� approach to an argument is primarily useful when the quality of a choice is difficult to ascertain by other means and there is little alternative information. In other words, the authors of the 鈥渘o鈥� case assume voters do not know how to judge whether the Voice will be a good or a bad thing, and may not consider much other information than this particular pamphlet.

It will come as no surprise to learn that people are more easily persuaded that a standpoint like 鈥渢he Voice will be bad鈥� is correct if campaigners provide strong arguments for this. You can聽聽yourself at work by making a simple request to people queuing to use a photocopier:

Excuse me, I have five pages 鈥� may I use the photocopier?

Generally about two out of three people asked will allow you to use the copier before them. Now make the same request, but with a reason:

Excuse me, I have five pages 鈥� may I use the photocopier because I鈥檓 in a hurry?

In that case, almost everybody accedes.

At first sight, this hardly seems astounding: people are more likely to comply with a request if they have a good reason. However, the more-is-better approach is not so much about the聽substance聽of an argument as the mere fact that one or more are given. So, for example, when you ask,

Excuse me, I have five pages 鈥� may I use the photocopier because I have to make copies?

again, almost everybody complies. That is even though they have not actually received any new information; it just feels like they have.

聽people are also less persuaded by a standpoint backed with three strong arguments than by one with three strong聽and聽three weak arguments to support it.

This article was originally published on聽The Conversation听补蝉:听. It was written by Tom van Laer, Associate Professor of Narratology, University of Sydney Business School.