Conduct pre- and post-work assessments for heavy goods and public service vehicle body building activities

Business Sectors (Suites): Coachbuilding
Developed by: IMI
Approved on: 30 Mar 2020


This standard is about carrying out pre- and post-work assessments of vehicles using a variety of basic assessment methods and defect recording. The unit requires knowledge and understanding of the materials and building construction techniques used in heavy goods and public service vehicle body and chassis components.

Performance criteria

You must be able to:

P1. use the appropriate personal protective equipment throughout all assessment activities 
P2. support your assessment activities by reviewing: 

P2.1. vehicle technical data 
P2.2. industry approved procedures and techniques
P2.3. legal requirements  
P3. carry out systematic vehicle assessments following: 

P3.1. manufacturer's data and instructions (if appropriate) 
P3.2. your workplace manuals and procedures 
P3.3. health, safety, environmental and legal requirements  
P4. ensure your comparison of the vehicle against specification accurately identifies any: 

P4.1. differences from the vehicle specification 
P4.2. vehicle appearance and condition faults  
P5. work in a way which minimises the risk of: 

P5.1. damage to other vehicle systems, units and components 
P5.2. contact with leakage and hazardous substances 
P5.3. damage to your working environment
P5.4. injury to self and others
P6. make suitable recommendations for future action based upon the results of your assessments *
P7. ensure your records are accurate, complete and promptly passed to the relevant person(s) in the format required 
P8. complete all *assessment activities within the agreed timescale and to specification 
P9. promptly report any anticipated delays in completion to the relevant person(s) 

Knowledge and Understanding

You need to know and understand:

**Legislative and organisational requirements and procedures**
K1. the legal requirements relating to the vehicle (including road safety requirements)
K2. the implications on an Operator’s Licence of not carrying out repairs correctly 
K3. the legislation and workplace procedures relevant to: 

K3.1. health and safety 
K3.2. the environment (including waste disposal) 
K3.3. appropriate personal and vehicle protective equipment
K4. your workplace procedures for: 

K4.1. recording pre- and post-work assessments and any variations from specifications 
K4.2. the referral of problems 
K4.3. reporting delays to the completion of work 
K5. the importance of making accurate records of the results of your assessments and interpreting them correctly 
K6. the importance of working to agreed timescales and keeping others informed of progress 
K7. the relationship between time and costs 
K8. the importance of promptly reporting anticipated delays to the relevant person(s) 

Use of technical information
K9. how to find, interpret and use recommended sources of information 
K10. the importance of using recommended sources of information to assist your assessment of heavy goods and public service vehicles  

Conducting assessments   *
K11. how to follow workplace procedures for the systematic pre- and post-work *assessment *of vehicles 
K12. how to check the basic operation of vehicle systems and vehicle condition 
K13. how to compare *assessment results against vehicle specifications and legal requirements 
K14. the importance of discussing findings based upon the results of your assessments to the relevant person(s) 

K15. how to record faults and assessment results in the format required

Types of metals, alloys and composites, usage and properties *  
K16. the different types of *materials used within a motor vehicle body and chassis construction along with their properties. 
K17. the different body and chassis components that are made using the different materials listed (including advantages and disadvantages) 
K18. how the type of materials used affects the safety, design, cost and construction of large goods and public service vehicle bodies and chassis 
K19. how different materials used in construction react with each other  
K20. How to reduce the effects one material *might have on another and the environment
K21. the importance of cleanliness and avoidance of cross contamination when working with different *materials 
K22. how to recognise the type of material used in the construction of vehicle body and chassis components 
K23. emerging technologies and materials for construction of vehicle body and chassis components 
K24. recycling of vehicle body and chassis components, now and future

*Vehicle structure, chassis design and alignment *
K25. the different type of chassis designs used in heavy goods and public service vehicles, for example separate, semi- integral and integral structures 
K26. the relationship between vehicle structure/chassis design and: 

K26.1. strength and weight 
K26.2. type of vehicle 
K26.3. construction *materials *
K26.4. maintenance 
K26.5. cost 
K27. how to check a vehicle for correct chassis alignment and how to check sub-assembly 
K28. how manipulation of the vehicle body and chassis will affect the residual strength 

K29. the different mixes of composite, all metal and pressed steel, underframe, floor, bodysides, front and rear ends and roof used in the construction of large goods and public service vehicles 
K30. chassis constructional principles with reference to: 

K30.1. structural considerations 
K30.2. sectional form 
K30.3. operational requirements

*Body mounting *
K31. the procedures in the different methods of body mounting appropriate to the vehicle bodywork of different types of vehicle chassis design e.g. four flexible mounts, two flexible mounts etc. 
K32. the factors to be taken into account with regard to the selection of appropriate methods of vehicle body mounting


1. Assessment methods are: 

1.1. sensory 
1.2. functional 
1.3. measurement

2. Materials include:

2.1. mild steel
2.2. ultra high strength steels (UHSS)
2.3. aluminium alloys
2.4. alloys
2.5. stainless steel
2.6. plastics
2.7. composites
2.8. timber
2.9. natural and synthetic rubbers

Scope Performance

Scope Knowledge





*This section contains examples and explanations of some of the terms used but does not form part of the standard.*
**Agreed timescales**
Examples include: manufacturer's recommended work times, job times set by your company or a job time agreed with a specific customer 
**Heavy goods and public service vehicles**
These are medium and large goods vehicles, buses and coaches of 3500kgs gross vehicle mass (GVM) and above 
**Sources of technical information**
Examples include inspection schedules, manufacturers' manuals and Trade Association check lists, workplace procedures, tester's manual, driver's handbook, categorisation of defects, repair method instructions, standard operating procedures, OEM build standards

Links To Other NOS

External Links

Version Number


Indicative Review Date

31 Mar 2024





Originating Organisation


Original URN


Relevant Occupations

Bus and Coach Body Repairer, Coachbuilder

SOC Code



Pre-work; post-work; assessment; heavy goods vehicle; public service vehicle; body;