For a message to be understood, it must travel through the communication process β encoded by the sender, carried by a method, and decoded by the receiver β without being distorted. The method chosen clearly matters, but whether it is the most important factor in ensuring understanding depends on the situation.
The case that method choice is the most important factor. The method strongly shapes whether a message is understood. A detailed, technical message delivered verbally may be forgotten or muddled, whereas the same message in writing is accurate and referable. Sensitive news delivered by a cold email can be misread, whereas face-to-face delivery conveys tone and allows clarification. A page of figures may confuse staff, whereas a clear chart makes the trend obvious. In each case, choosing the wrong method directly causes misunderstanding, so matching method to message can be the decisive factor in whether communication succeeds.
The case that other factors matter more. First, the clarity of the message itself can outweigh the method: a poorly written or jargon-filled message will be misunderstood whatever method carries it, while a clear message survives a less-than-ideal method. Second, feedback is essential: even the best method fails if there is no way for the receiver to confirm understanding or ask questions, so building in two-way communication may matter more than the method. Third, barriers and 'noise' β language differences, cultural gaps, a long chain of command, or a demotivated, inattentive receiver β can block understanding regardless of method. Fourth, the skills and attitude of sender and receiver (listening, encoding clearly, willingness to engage) heavily influence understanding. These factors suggest method is one of several determinants, not automatically the most important.
Weighing it up (criterion). The most important factor depends on where the greatest risk of breakdown lies for that message. If the danger is that the message is too complex or sensitive for the chosen channel, method choice is decisive. If the danger is unclear wording, no feedback, or barriers such as jargon or a long chain, then those factors matter more β fixing the method alone would not ensure understanding.
Judgement. Choosing the right method is a very important factor β often the first thing to get right β but not universally the most important. It is most decisive when the mismatch between method and message is the main threat to understanding, such as detailed information sent verbally or sensitive news sent electronically. However, where the real obstacles are unclear messages, missing feedback, or barriers like language and a long chain of command, those factors outweigh method choice. The most defensible conclusion is that ensuring understanding requires getting several things right together β a clear message, an appropriate method, feedback and the removal of barriers β so method choice is best seen as one essential factor among several, decisive in some situations but not in all.