You need to show experience and qualifications in occupational area then the new equivalent of the Cert IV Workplace Assessor which is now:
Should find course outline here:
http://www.ntis.gov.au/ and
TAA50104 Diploma of Training and Assessment Australia
I could probably put you in touch with a training org who can deliver online, plus assess RPL i.e. previous studies and experience for credit.
Cheers Andrew
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Andrew Smith
Cert IV Workplace Assessor & Trainer, B. Bus., Cert. TEFLA, Grad. Dip. Ed. & Training, M. Ed. & "Aussie Specialist"
http://www.aiec.biz