OSSTMM test types 

OSSTMM divides the testing types into six broad categories based on the amount of information known to the tester:

Here are these types represented in a graph:

Source: https://www.isecom.org/OSSTMM.3.pdf
License: https://creativecommons.org/licenses/by/3.0/

Now that we have read through the different OSSTMM test types, let's look at ISSAF.