The challenge with findability and discoverability issues is determining the root cause: is it the information architecture or is it the navigation design? (Nielsen Norman Group)

The findability/discoverability challenge is even more critical when considering intranets, knowledge bases, and other internal content/document management systems, where users may need to wade through thousands of documents to find what they’re seeking (enterprise knowledge)

The best way to begin measuring the findability of your website is to identify a product or service, a resource such as a web form or document, or web content such as a blog post or video and attempt to locate this content on your website, both by using a search engine like Google and by visiting the homepage of your website and utilizing menus and internal search capabilities that are present on your homepage. (Blue Zenith)