If you’re asking that question, something has already gone horribly wrong. You should avoid any situation that has you asking yourself how far you can stretch the user’s memory limits.
“…three-partedness appears to have ‘programmatic relevance’ for the construction of lists. That is, roughly, lists not only can and do occur in three parts, but should so occur.”
So if you’re designing a Conversational Action for the Google Assistant, and have multiple features a user can try, see if you can avoid putting them all in one list of options right away. Instead, try to present a maximum of three options with one or more of those options leading to a few more.
visually-impaired users or those who can’t reposition themselves to look at a screen have no choice but to rely on voice, so a three-at-a-time strategy is even more critical for this important population.
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