I know that something similar was already discussed here, but my situation is rather different. I've been told that, to keep a resume/CV down to a reasonable length, it's OK not to list my very earliest jobs, such as those I had in or soon after high school (and which aren't at all relevant to the position of GIS technician I'm seeking now).
Because it took so long for my career plans to crystallize, I still have rather little relevant experience, and much of my work history consists of "high-school-type" jobs. My question, then, is, how far back to describe my work history if the employer doesn't specify this? A staffing agency that asked for my resume massaged it to include only the stuff relevant to the position I'm seeking. That, however, makes it look as if I have very little work history indeed, although I've gotten a few interviews with that type of resume.
I've also tried listing the relevant experience, arranged chronologically, first, followed by a small section that lists (but doesn't describe) the irrelevant stuff, again arranged chronologically. This type of resume, however, has been no better or worse at getting me interviews.
How, then, should I structure my resume? Should I include only relevant experience? Or should I list other things, too, and, if so, how far back? I'm concerned that the experience I want to highlight will get lost among all the other clutter.