What are some best practices when doing testing to compare different design ideas?

1. How to do comparative usability testing?
2. How do you test designs?

How to do comparative usability testing?

To conduct a proper comparative usability test, two conditions must be met: The design needs to change between participants' experiences with different versions (i.e., A/B testing). – The tasks should remain constant across all designs under study.

How do you test designs?

Testing and design thinking

Define a problem statement based on what you've learned about your users. Ideate creative solutions to the problem. Prototype models of concepts, products, and features. Test your ideas and prototypes with real user groups to understand what works and what doesn't.