Assessor Resource

WRHHS301A
Apply the principles of hairdressing science

Assessment tool

Version 1.0
Issue Date: March 2024


This unit requires operators to demonstrate in their practice an understanding of skin and hair biology and cosmetic chemistry as they apply to the performance of hairdressing services. Knowledge of the physical and chemical action of hairdressing products on the skin and hair is required to inform the selection and safe application of a range of services.

In the context of an assessment-only and/or a training delivery and assessment pathway, units of competency that relate to this unit are identified in the evidence guide of this unit.

This unit describes the skills and knowledge required to apply the principles of skin and hair biology and cosmetic chemistry to hairdressing services. This unit of competency will apply to a range of hairdressing services and roles in the workplace.

You may want to include more information here about the target group and the purpose of the assessments (eg formative, summative, recognition)

Prerequisites

Not applicable.


Employability Skills

This unit contains employability skills.




Evidence Required

List the assessment methods to be used and the context and resources required for assessment. Copy and paste the relevant sections from the evidence guide below and then re-write these in plain English.

The evidence guide describes the underpinning knowledge and skills that must be demonstrated to prove competence. It is essential for assessment and must be read in conjunction with the performance criteria, the range statement and the assessment guidelines of the relevant Training Package.

Overview of assessment

A person who demonstrates competency in this unit of competency must be able to identify and describe skin and hair science, including the anatomy of human skin and hair, and apply knowledge of the action of common tools and chemicals to the performance of hair and scalp treatments. Knowledge and understanding of the principles of skin and hair biology as they relate to hair and scalp treatments must be demonstrated.

Specific evidence requirements

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

knowledge and consistent application of relevant workplace policies and procedures

knowledge and consistent application of federal, state and local health and hygiene legislation and regulations

knowledge and consistent application of safe work practices and the safe use of products and equipment (including the use of preventative measures) according to manufacturer safety manuals and occupational health and safety legislation and regulations

knowledge and consistent application of the principles of skin and hair science as they apply to hairdressing services including:

main functions and roles of the skin

structural and cellular features of hair and hair follicles

process of hair growth and the hair growth cycle

physical and chemical effects of hairdressing services on the skin and hair

characteristics of normal and damaged hair

contraindications to particular services.

Context of assessment

For valid and reliable assessment of this unit, competency should be consistently demonstrated over a period of time and observed by the assessor and/or the technical expert working in partnership with the assessor. The technical expert may include the hairdresser and/or trichologist and may be in a simulated environment.

Competency should be demonstrated in the workplace or a simulated workplace environment in a range of situations that may include client interruptions and involvement in other related activities normally expected in the workplace. For further guidance on the use of an appropriate simulated environment, refer to the Assessment Guidelines in this Training Package.

Specific resources for assessment

Competency for this unit should be assessed through access to:

relevant documentation, such as workplace policy and procedures manuals

a range of clients with different requirements

a range of equipment and products appropriate to the hairdressing/trichology workplace

product labels, charts and sources of product information

a qualified workplace assessor or assessment team.

Relationship to other units

This unit is a co-requisite to a range of hairdressing units. It requires an assessment outcome that includes the application of hairdressing science knowledge to the performance of one or more hairdressing treatments.

:

none.

:

WRHCL302B Colour and lighten hair

WRHCL303B Design and perform full and partial highlighting techniques

WRHCL304A Perform colour correction

WRHCR302B Perform chemical curling and volumising services

WRHCR303B Perform chemical straightening and relaxing services

WRHHS302A Consult with clients and treat hair and scalp conditions.

Method of assessment

The following assessment methods are suggested.

Observation of the learner performing a range of tasks in an actual or simulated work environment, over sufficient time to demonstrate his/her handling of a range of contingencies. Tasks may include:

identifying the principles of hair science and developing and maintaining safe work practices

completing workplace documentation relevant to client analysis prior to hairdressing treatments

performing consultation, and hair and scalp analysis

safely performing a variety of treatment processes.

Written and/or oral questioning to assess knowledge and understanding of:

structural and cellular features of the hair and hair follicles

hair growth cycle

hair colour

effects of chemical curling, volumising and straightening products on the structure of the hair

relationship between the pre-existing condition of the hair and scalp and the provision and/or contraindication of some services.

Third-party reports from experienced hairdressers.

Completion of self-paced learning materials, including personal reflection and feedback from the trainer, coach or supervisor.

Evidence required for demonstration of consistent performance

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

It can be gathered from assessment of the unit of competency alone, through an integrated assessment activity or through a combination of both.

Evidence should be gathered as part of the learning process.

Assessing employability skills

Employability skills are integral to effective performance in the workplace and are broadly consistent across industry sectors. How these skills are applied varies between occupations and qualifications due to the different work functions and contexts.

Employability skills embedded in this unit should be assessed holistically in the context of the job role and with other relevant units that make up the skill set or qualification.


Submission Requirements

List each assessment task's title, type (eg project, observation/demonstration, essay, assingnment, checklist) and due date here

Assessment task 1: [title]      Due date:

(add new lines for each of the assessment tasks)


Assessment Tasks

Copy and paste from the following data to produce each assessment task. Write these in plain English and spell out how, when and where the task is to be carried out, under what conditions, and what resources are needed. Include guidelines about how well the candidate has to perform a task for it to be judged satisfactory.

This describes the essential skills and knowledge and their level, required for this unit.

Skills may include:

preventing possible skin and hair damage situations

identifying client characteristics and recommending and performing a service, including:

preparing the service area

preparing products and equipment

preparing the client

communication skills that take into account the culture, background and physical abilities of the client while demonstrating knowledge of the following communication techniques:

using open and closed questions

speaking clearly and concisely

using appropriate language

non-verbal and written communication

language, literacy and numeracy skills relevant to the role and workplace requirements.

Knowledge may include:

the provisions of relevant health and hygiene legislation and regulations

the provisions of relevant skin penetration legislation and regulations

the provisions of relevant occupational health and safety legislation and regulations

knowledge of the principles of hairdressing science as they relate to hairdressing treatments

workplace policies and procedures in regard to the performance of hairdressing services

knowledge of skin biology in relation to scalp treatments and procedures

knowledge of hair biology in relation to common hairdressing treatments

the workplace product, treatment and equipment range and manufacturer's instructions and product safety data sheets.

The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that will affect performance.

The following variables may be present with training and assessment depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts. Bold italicised text from the performance criteria is detailed here.

The main structure, functions and role of the skin may include:

structure and function of the glands of the skin

relevant skin surface anatomy

major epidermal appendages and dermal structures

major cells of the epidermis

role of vascular, connective and nervous tissue in the dermis.

The structure and function of the glands of the skin may include:

structure, function, distribution and development of skin glands

production, composition and functions of sebum

production, composition and functions of eccrine and apocrine sweat fluids.

Physicaleffects of scalp treatments may include:

conditioning

removal of excess skin cells

removal of excess sebum.

The main functions and role of hair may include:

thermo-regulation

protecting the scalp from physical damage

controlling micro-organisms on the skin.

The glands and muscles associated with the hair and hair follicles may include:

structural and cellular features of a hair follicle

sebaceous glands

arector pili muscle.

The structural and cellular features of hair and hair follicles may include:

hair shaft

layers of the hair

hair root and follicle.

The process of hair growth and the hair growth cycle may include:

hair growth cycle

anagen (growth phase)

catagen (transitional phase)

telogen (resting phase)

influences on hair growth rate.

The characteristics of normal and damaged hair may include:

hair type: coarse, medium and fine

texture

porosity.

Hair colour and chemical reformation may include:

main factors contributing to hair colour

origin, structure and location of melanin.

Physical effects of hairdressing services may include:

effects on hair structure

effects on hair texture

degree of curl or wave in hair

hair colour.

Concepts of cosmetic chemistry may include:

bonds

molecules

chemical compounds

chemical change

neutralisation and buffering

organic chemistry

chemical reactions

acids and bases and their effect on skin and hair

pH.

Relevant legislation may include:

federal, state and local health and hygiene

occupational health and safety.

Workplace policies and procedures may include:

client comfort and safety

operator safety

health and hygiene.

Range of hairdressing products may include:

colouring products

lightening products

chemical reformation products

chemical relaxation products

temporary setting aids

topical products including sprays and waxes

trichological treatments.

Contraindications may include:

allergic reactions

hair porosity.

Potential environmental damage may include:

ultraviolet (sun) light

excessive use of overheated thermal equipment.

Copy and paste from the following performance criteria to create an observation checklist for each task. When you have finished writing your assessment tool every one of these must have been addressed, preferably several times in a variety of contexts. To ensure this occurs download the assessment matrix for the unit; enter each assessment task as a column header and place check marks against each performance criteria that task addresses.

Observation Checklist

Tasks to be observed according to workplace/college/TAFE policy and procedures, relevant legislation and Codes of Practice Yes No Comments/feedback
The main structure, functions and role of the skin are identified and applied to the provision of hairdressing services. 
The structure and function of the glands of the skin are identified and applied to the provision of hairdressing services. 
The physicaleffects of scalp treatments on the skin are identified and related to the performance of hairdressing treatments. 
The main functionsand role of hair are identified and applied to the provision of hairdressing services. 
The glands and muscles associated with thehair and hair follicles are identified and applied to the provision of hairdressing services. 
The structural and cellular features of hair and hair follicles are identified and applied to the provision of hairdressing services. 
The process of hair growth and thehair growth cycle are identified and applied to the provision of hairdressing services. 
The characteristics of normal and damaged hair are identified and applied to the provision of hairdressing services. 
Factors affecting hair colour and chemical reformation are identified and applied to the provision of hairdressing services. 
The physical effects of hairdressing services on the hair are identified and applied to the provision of hairdressing services. 
The relevant concepts of cosmetic chemistry are identified and related to the safe performance of hairdressing services, according to relevant legislation and workplace policies and procedures. 
The range of chemicals used in hairdressing treatments is assessed and related to the performance of hairdressing services. 
Suitability of the hair for chemical services is based on analysis of the effect of previous chemical services or environmental factors on the condition of the hair. 
The formulation of a range of hairdressing products is assessed in relation to the products' purpose and action on the hair. 
Contraindications are identified where they relate to client health and safety, hair condition and/or service outcomes. 
Knowledge of the physical and chemical actions of a range of hairdressing products is applied during services to maximise the promotion of hair and scalp care, and client and operator safety. 
Knowledge of potential environmental damage to hair is applied in the provision of after care service and advice. 

Forms

Assessment Cover Sheet

WRHHS301A - Apply the principles of hairdressing science
Assessment task 1: [title]

Student name:

Student ID:

I declare that the assessment tasks submitted for this unit are my own work.

Student signature:

Result: Competent Not yet competent

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Assessor name:

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Assessment Record Sheet

WRHHS301A - Apply the principles of hairdressing science

Student name:

Student ID:

Assessment task 1: [title] Result: Competent Not yet competent

(add lines for each task)

Feedback to student:

 

 

 

 

 

 

 

 

Overall assessment result: Competent Not yet competent

Assessor name:

Signature:

Date:

Student signature:

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