Required skills

use of appropriate equipment and consumables

ability to work safely with opal cutting equipment and materials

Required knowledge

the materials that are most suitable for making doublets or triplets

the equipment and consumables needed for making doublets and triplets

The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria required skills and knowledge range statement and the Assessment Guidelines for the Training Package

Critical aspects for assessment and evidence required to demonstrate competency in this unit

To achieve competency in this unit a person must be able to select appropriate materials for making into a doublet or triplet and complete all preforming processes using safe working practices

Assessment must confirm the ability to select the materials for making into a doublet and to make decisions on how to cut the material and what the final product should be It involves preparing the opal and the backing material flattening the stone and backing and cementing the two together It also involves using the same skills to make a triplet from a very thin opal layer with a transparent triplet top

Competence in this unit must be assessed over a period of time in order to ensure consistency of performance over the range of variables and contexts applicable to the work environment

Context of and specific resources for assessment

This unit may be assessed in a work environment in a simulated work environment or in a combination of these situations

Method of assessment

For valid and reliable assessment of this unit evidence should be gathered through a range of methods to indicate consistent performance

Assessment of this unit of competence will usually include observation of processes and procedures oral andor written questioning on underpinning knowledge and skills evaluation of the final product and other methods as required

Assessment methods should closely reflect workplace demands eg literacy and the needs of particular groups eg people with disabilities and people who may have literacy or numeracy difficulties such as speakers of languages other than English remote communities and those with interrupted schooling

Assessment of this competency requires access to

an opal cutting workshop

a qualified workplace assessor or assessment team

Suitable material may include:

Appropriate equipment may include:

Backing materials may include:

Blacking agents may include:

Adhesives may include:

Triplet top materials may include

General OHS principles and Safe Operating Procedures sheet may include: