https://www.epo.org/en/service-support/faq/searching-patents/patent-management-and-valuation/what-exactly-evaluated-patent

What exactly is evaluated in a patent evaluation?

When carrying out a patent evaluation, it is important not only to consider the patent as an exclusivity right, but also to consider its underlying technology, as well as the company's ability to use its complementary assets (i.e. its ability to commercialise the invention).

While it may be desirable to value each patent individually in theory, in practice, it can be difficult to separate two interdependent patents.

In many cases, it makes sense to evaluate whole patent clusters rather than individual patents.