There are many skills in this area that stay the same through the technology bubble we are witnessing in information technology. When you write you need two things. 1.) Purpose 2.) Target audience.
Concentrating on Audience for this reply... a very good technique is to use a "personna" or "profile." Create a fictious person providing an age, gender, education level, personal habits and so on. You then write that that target. Of course, not everyone who reads will fit in the personna exactly, but your personna will will have a bell curve associated of applicability to other audiences. Agree on the personna with all who are contributing material.
It works almost like magic.