Why is user testing ah important part of the design process

The general description of the whole of the general concept is described below.

Explanation:

Usability testing would be an important part including its customer construction business it allows users to see what works and where it doesn't function properly with someone's design elements. Keep challenging yourself to provide much more of your workshops through using at least yet another novel concept from that kind of blog post during your very next or even first and another round of research.

The type of program is the hierarchical grid

Idk with yr talking about there's nothing no even a pic so how can ppl u not trying to be rude or anything