My resume is currently organized in a standard format with Job title, city/location, description, start and end dates for each job or internship that I have held in the past.
I do have one company (actually my father's engineering firm) which I provide consulting/assistance to in an intermittent manner. Meaning they call me for small well-defined jobs which I then execute in short time periods of one to two weeks. This has been going on for a little while (Maybe the last two years?) but has provided me with valuable experience which I need to be able to list for some of my job applications.
How do I successfully include this "position" without deviating from my established, tried and true format. Specifically I would like to know what relevant Job title, city/location, description, start and end date type data fields that would accurately represent it on a standard form resume.