ich glaub er meint diesen passus:
Assessments in these trades are against specified criteria;
Acceptable formal training outside Australia. This entails a pass mark in a formal trade test conducted by a government-approved body of that country, and a Trade Certificate / Diploma must be supplied. This test must be preceded by a formal apprenticeship not shorter than three years (usually 4). The applicant must be able to evidence than an apprenticeship contract existed between him and an employer. A copy of the Apprenticeship Contract must be supplied
The applicant must have been working in the trade for a period of not less than three years AFTER completion of the apprenticeship. (A total of 6 years combined.) If the Trades Person intends to act as Main Applicant for Skilled Migration, he/she must have been in paid employment in the trade (or closely related occupation) for at least 12 out of the last 18 months prior to applying for the visa.