How to deal with a "large" number of choices on mobile?

Question

I would like to ask a user about his interests. Suppose there are a total of 10-15 (or even more) topics from which the user can choose as many as desired. There might be another section with the same amount of choices.

Which is the better way on mobile devices:

1. To limit the number of topics in advance to e.g. 5
2. To limit the number of topics in advance but provide a "Show more" button. On click the next 5 topics are shown
3. As 2. but on click all remaining topics are shown.

Are there some best practices or other proofen arguments?

Answer 1

Here are some general tips:

Use infinite scrolling. Scrolling is easy on a mobile device. Therefore a "Show More" button is usually less desirable than detecting when a user has scrolled to the bottom of the screen and automatically loading more content.

Choose how many items to display initially based on performance. Load as many items as you can within a certain (short) time frame. If you can load all the questions as once, it's usually better to do so.

When the user answers a question, automatically scroll to the next question so they don't have to move their fingers.

Allow each question to be answered using gesture. Such as a swipe left or right interface.

Answer 2

Make it a Hot or Not (tinder) kinda interface, at least that way it's more visually engaging and not just a list with small touch interactions.