To apply for a Points Tested Skilled Migration visa, an applicant must nominate an occupation that is on the relevant list of eligible skilled occupations and provide evidence that skills have been assessed as suitable by the relevant assessing authority. The evidence needs to be in the form of a scanned certified copy of a positive skills assessment which will be used for Points Test calculations.
Learn more at: Skills Assessment General

Based on the number of visas granted in Skilled Streams in 2014-2015 and 2015-2016, it can be assumed that around 100,000 skills assessments are undertaken each year. Major assessing authorities (agencies) are VETASSESS, ACS, Engineers Australia, TRA (and its approved RTO’s), ANMAC and accounting bodies (CAANZ, CPAA, IPA). Skills assessment criteria are dependent on the nominated occupation and are determined by each assessing authority in accordance with relevant professional standards
Learn more at: Skills Assessment Authorities

The Australian and New Zealand Standard Classification of Occupations (ANZSCO) was developed jointly by the Australian Bureau of Statistics (ABS), Statistics New Zealand (Statistics NZ) and the Australian Government Department of Employment and Workplace Relations (DEWR) to improve the comparability of occupation statistics between the two countries and the rest of the world. ANZSCO provides a means of comparing Australian and New Zealand occupation statistics with international statistics, The International Standard Classification for Occupations (ISCO-08). ANZSCO First Edition was released in September 2006 and revision 1 added in June 2009.
Learn more at: Skills Assessment ANZSCO

In order to be eligible for a skilled migration you need to have an occupation  that is present on STSOL, MLTSSL or ROL list of the eligible skilled occupations. The skilled migration occupation lists form the basis of employer-sponsored, points-tested and state-nominated visa programs. To respond to changes in the labour market and to accommodate regional variations across Australia, these lists are reviewed on a regular basis by the Department of Jobs and Small Business. The last significant update to STSOL, MLTSSL, and ROL was on 11 March 2019. The ROL list was also updated on 16 November 2019 to reflect changes related to the new regional visas. The next update to the skilled occupations lists is not expected earlier than 2020.
Learn more at: Skilled Occupation Lists

A registered migration agent (RMA) is a qualified professional who is registered with the Office of the Migration Agents Registration Authority (OMARA). It is not required to use an agent, but if an individual decides to seek assistance, they should engage a registered migration agent. RMA can recommend a suitable visa option and help lodge a decision-ready application with all required documents.
Read more at: Immigration Assistance

VETASSESS was established in 1997 and has become Australia’s leading vocational education and training (VET) assessment provider. It is a designated assessing authority for more than 240 professional occupations which makes almost half of all the occupations on the combined current list of eligible occupations.
Learn more at: Skills Assessment Vetassess

Australian Computer Society (ACS) is an association for ICT professionals and a peak body representing Australia’s ICT sector. ACS was formed by merger of several state based societies and in 2016 it celebrated its 50th birthday. ACS is responsible for just over 20 occupations or about 5% of all the occupations on the combined current list of eligible occupations.
Learn more at: Skills Assessment ACS

Certified Practising Accountants Australia (CPAA) is one of the largest accounting bodies that represents more than 163,000 members in 125 countries and regions. The history of CPA Australia started with the foundation of the Incorporated Institute of Accountants, Victoria, in 1887. CPAA provides services to members that include education, training, technical support and advocacy. As an assessing authority, it is responsible for 5 occupations or just about 1% of all the occupations on the combined current list of eligible occupations.
Learn more at: Skills Assessment CPAA

Engineers Australia(EA) was founded in 1919 and was incorporated as a company in 1926. It is Australia’s principal engineering association that represents around 100,000 professionals. EA is responsible for about 30 occupations or just over 5% of all the occupations on the combined current list of eligible occupations.
Learn more at: Skills Assessment EA

Trades Recognition Australia (TRA) is a skills assessment service provider specialising in assessments for people with trade skills gained overseas or in Australia. It has existed in some form or another since 1946 as an element of post-war reconstruction in Australia. TRA is responsible for nearly 100 occupations which is about one fifth of all the occupations on the combined current list of eligible occupations.
Learn more at: Skills Assessment TRA

The Australian Nursing and Midwifery Accreditation Council (ANMAC) was established in 1992 as an independent accrediting authority for nursing and midwifery education under Australia’s National Registration and Accreditation Scheme. As an assessing authority, ANMAC is responsible for 20 occupations or just about 4% of all the occupations on the combined current list of eligible occupations.
Learn more at: Skills Assessment ANMAC

The Australian Dental Council (ADC) was formed in 1993 by the dental
boards of the states and territories of Australia, the Australian Dental Association and the Committee of Deans of Dental Schools in Australia. Under the National Registration and Accreditation Scheme (NRAS), the ADC is the designated independent accreditation authority for the Australian dental professions by the Dental Board of Australia (DBA). As an assessing authority, the ADC is responsible for dentist and related occupations on the combined current list of eligible occupations.
Learn more at: Skills Assessment ADC

To receive a free assessment of your chances in skilled migration complete Professional Migration assessment and provide detailed answers to all questions and , in particular, accurate information about your education including educational institutions, years of study, courses names, and work experience including years of employment, positions names and job tasks.
Complete assessment at: Professional Migration Eligibility