In Lausanne, does an expert’s signature make a message more persuasive?
In Lausanne, collaborations between medtech companies, higher education institutions, international sports organisations and scale-ups across the Lake Geneva region bring together recommendations backed by very different kinds of authority. For a manager, the precise question is this: does highlighting the sender’s expertise help people evaluate a proposal, or mainly encourage them to accept it?
What the literature establishes
Carl I. Hovland and Walter Weiss (1951, Public Opinion Quarterly) presented identical communications attributed to sources with different levels of credibility. Overall, sources considered more credible produced greater immediate opinion change, without a corresponding advantage in learning the content. This finding separates two effects that managerial communication can easily conflate: securing acceptance of a recommendation and helping people retain its supporting arguments.
Credibility does not operate independently of the message
Chanthika Pornpitakpan (2004, Journal of Applied Social Psychology) reviews five decades of research on source credibility. The review finds a generally favourable effect for highly credible sources, but also interactions with the message, channel, recipient characteristics and outcome measured. A signature is therefore not a lever with a constant effect: it operates within a particular communication setting.
The premature conclusion
One might conclude that recommendations should simply be signed by the most recognised person available. Yet the cited research concerns persuasion, not the soundness of the resulting decisions. Expertise is a relevant cue when it matches the subject under discussion; it does not remove the need to make the arguments open to scrutiny. (our executive and employee training programmes)
What the evidence cannot guarantee
The classic experiments do not reproduce an organisation’s lasting relationships, hierarchical dependencies or regulatory responsibilities. The review brings together heterogeneous research designs: it does not provide a numerical effect directly transferable to a Lausanne company. In practice, a signature may also identify who takes responsibility for a recommendation, a function that a persuasion test does not necessarily measure.
A practical check in Lausanne
As part of SHR’s “Communication” programme, a Lausanne team could test a fictional recommendation with no operational consequences, randomly assigning participants to two otherwise identical versions: one gives the real author’s name and role, while the other adds their relevant, verifiable expertise. Agreement with the recommendation and the ability to recall its arguments accurately should then be assessed separately, using a scoring rubric defined before the test. The central measure is the difference between versions on these two outcomes, retaining group sizes and anonymised responses so that the results can be checked. Greater agreement without better recall would suggest a credibility effect rather than a demonstrated gain in understanding, without establishing that either version is superior for real decisions. To go further: explore the Communication training in Lausanne in the canton of Vaud, or browse our executive and employee training programmes in Switzerland.
In pictures: Communication in Lausanne
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