The idea behind using the term countermeasures is that it’s a temporary fix to address the root causes at hand. Typically, people view solutions as something permanent, with the expectation that it doesn’t need to be revisited unless of course something is wrong. Thinking about solutions in the form of countermeasures is more experimental in nature, and encourages the idea that this whole process is cyclical, and that you and others may try to make the situation better, regardless of the outcome of the countermeasures that were implemented. Solutions imply one and done. Countermeasures imply that situations change all the time, and there will likely be other cycles besides just one.