I am looking to find studies that have been conducted in the ratio of
the number of IT support staff (helpdesk,break fix, system admins) to
operational users. It would be help if the study was to consider both
thin and full client installtions.

the Studies need to be from highly regarded consultancy practices or
academic bodies

Best regards

If it matters, I am the main/only IT guy for roughly 150 PCs, and
about some 100 users (labs and duplicate PCs in classrooms account for
discrepancies). (My immediate supervisor can assist when I am on
vacation, but that is rare)

The PCs have full install of OS and App software. I maintain a lot of
it remotely via Terminal Services, VNC, and compmgmt.msc. Most of the
installs are Win2K Pro, but increasingly WinXP Pro as new computers
are added.

Nope, not a "study"... but I hope it helps.

Thank you,

Your comment does indeed comfirm my belief that the ratio is <3-4% the
Issue that I face is that I require a reasonably large sample size of
companies.

But thank you, you have re-inforced my theory

Also, if it helps/matters, consider many many small businesses can't
afford an IT guy onsite anyway, so they outsource to an IT firm who
would be, say, 1-5 techs for 20-50 plus companies from 1-50 users/PCs
each. The range is so great because some IT firms can barely support
one tech, usually the owner. I will briefly digress to say that being
an *independent* IT tech is tough because billing (unless at time of
delivery of services) usually takes a back burner to service, and it's
a rare tech that can/does take the time out of billable hours to deal
with receivables, which means income gets delayed and after-hours life
is nearly non-existant.