Source: https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-8-3-timber-quality-control [Revision notes](https://senecalearning.com/en-gb/revision-notes.md) › [GCSE](https://senecalearning.com/en-gb/revision-notes/gcse.md) › [Design & Technology](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology.md) › [AQA](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa.md) › Timber: Quality Control # Timber: Quality Control Design & Technology: AQA GCSE, topic 3.8.3 ## Quality Control Systems: Tolerance How materials are cut, shaped and formed to a tolerance. ### Cutting and shaping ![Cutting and shaping](https://image-v2.cdn.app.senecalearning.com/2018-09/7f4ccf7f-8d24-41e5-b28f-a62190a1baee/scissors-snip-colour-cut-.jpg) - Materials can be cut to form parts. - Sometimes those parts need to be identical but this is not always possible. - If we were to cut each material to size every time there would be mistakes. - Therefore we introduce a tolerance. ### Tolerance ![Tolerance](https://image-v2.cdn.app.senecalearning.com/courseImages/physics/1.1.1%20Measuring%20length,%20volume,%20etc.../ruler-150936_640%20-%20Edited-min.png) - Tolerance is an acceptable dimension that the piece can be. - Usually, 1 mm less or more than the specified measurement is tolerated. - This by no means allows for mismatched products to slip through the net but simply allows products to be checked and tested to see if they are still meeting quality standards. ### Go/no go systems ![Go/no go systems](https://image-v2.cdn.app.senecalearning.com/2019-04/cd1be6b6-28eb-4dfa-8960-4d28cb7e8021/go-sign-green-yes-.jpg) - A go/no go system is a gauge that tests against the tolerances set for a part. - The test can only be passed if you meet the ‘go’ requirement but fail the ‘no go’ requirement. ### Example ![Example](https://image-v2.cdn.app.senecalearning.com/2019-04/9bbfb641-965d-4c67-a0ad-d4f215cc6764/wood-hammer-tool-flat-pack-.jpg) - For example, if the dowel fits the specified hole securely (go test) and falls through the slightly larger hole (no go test) then it has passed the test. - If either of the tests fails then the part needs to be redesigned or remanufactured so it is within the tolerance boundaries. ## Commercial Processes Industry typically uses CNC routing. ### CNC ![CNC](https://image-v2.cdn.app.senecalearning.com/2018-09/368a76ad-99e2-41ef-be13-48b69e50fe7a/rush-hurry-deadline-time-clock-.jpg) - In industry, more expensive equipment is used to speed up production and increase the accuracy of wood products. - This is known as CNC routing. ### CNC cont. ![CNC cont.](https://image-v2.cdn.app.senecalearning.com/2018-09/7d894fb0-4733-4a20-9410-3aa86d6278ba/clock-70189_1920.jpg) - CNC stands for computer numerical control and routing is simply the hollowing out of material to create room for slotting materials together or for creating a pattern. - CNC allows for this to happen using grid coordinates and allows for accuracy every time. - The fact that the process is automated also helps to bring about speed and some peace of mind. ### Advantages ![Advantages](https://image-v2.cdn.app.senecalearning.com/2018-03/f36b7b79-ea0a-4679-9b4c-3e3dee2d7628/shutterstock_151790942.jpg) - Once the programming of CNC routing has been learnt then you can have fewer people working on a job or you can increase the number of products made. ### Disadvantage ![Disadvantage](https://image-v2.cdn.app.senecalearning.com/2018-09/248e9686-5354-4427-a960-a73bc15cb7b2/currency-money-.jpg) - The only disadvantage is that the initial costs of CNC tooling can be high, but if a company makes this investment they can increase their output considerably. ## Test yourself on Timber: Quality Control - What does CNC stand for? [Practise this topic for free](https://app.senecalearning.com/classroom/course/b4e64de8-a5d1-411b-81e2-aa4e2016e908/section/eda5b06c-9816-4471-93f0-9dafe8bc9d20/session) - Previous topic: [3.8.2 Timber: Tools, Equipment & Processes 2](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-8-2-timber-tools-equipment-and-processes-2.md) - Next topic: [3.9.1 Timber: Surface Treatments](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-9-1-timber-surface-treatments.md) ## Design & Technology: AQA GCSE contents ### 1 Core Technical Principles - 1.1 New & Emerging Technologies - [1.1.1 Industry](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-1-1-industry.md) - [1.1.2 Enterprise](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-1-2-enterprise.md) - [1.1.3 Sustainability](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-1-3-sustainability.md) - [1.1.4 People](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-1-4-people.md) - [1.1.5 Culture & Society](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-1-5-culture-and-society.md) - [1.1.6 Environment](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-1-6-environment.md) - [1.1.7 Production Techniques & Systems](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-1-7-production-techniques-and-systems.md) - [1.1.8 Emerging Technologies & Design](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-1-8-emerging-technologies-and-design.md) - [1.1.9 End of Topic Test - New & Emerging Technologies](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-1-9-end-of-topic-test-new-and-emerging-technologies.md) - [1.1.10 Exam-Style Questions - Emerging Technologies](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-1-10-exam-style-questions-emerging-technologies.md) - 1.2 Energy Generation & Storage - [1.2.1 Fossil Fuels & Nuclear](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-2-1-fossil-fuels-and-nuclear.md) - [1.2.2 Renewable Energy](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-2-2-renewable-energy.md) - [1.2.3 Energy Storage Systems](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-2-3-energy-storage-systems.md) - 1.3 Developments in New Materials - [1.3.1 Modern Materials](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-3-1-modern-materials.md) - [1.3.2 Smart Materials](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-3-2-smart-materials.md) - [1.3.3 Exam-Style Questions - Smart Materials](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-3-3-exam-style-questions-smart-materials.md) - [1.3.4 Composite Materials](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-3-4-composite-materials.md) - [1.3.5 Technical Textiles](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-3-5-technical-textiles.md) - 1.4 Systems Approach to Designing - [1.4.1 Inputs](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-4-1-inputs.md) - [1.4.2 Processes](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-4-2-processes.md) - [1.4.3 Outputs](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-4-3-outputs.md) - [1.4.4 Looped Systems](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-4-4-looped-systems.md) - 1.5 Mechanical Devices - [1.5.1 Types of Movement](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-5-1-types-of-movement.md) - [1.5.2 Levers](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-5-2-levers.md) - [1.5.3 Linkages](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-5-3-linkages.md) - [1.5.4 Rotary Systems](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-5-4-rotary-systems.md) - [1.5.5 End of Topic Test - Designing & Mechanical Devices](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-5-5-end-of-topic-test-designing-and-mechanical-devices.md) - 1.6 Materials Categories - [1.6.1 Timbers](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-6-1-timbers.md) - [1.6.2 Metals & Alloys](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-6-2-metals-and-alloys.md) - [1.6.3 Metals & Alloys 2](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-6-3-metals-and-alloys-2.md) - [1.6.4 Polymers](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-6-4-polymers.md) - [1.6.5 Polymer Types](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-6-5-polymer-types.md) - [1.6.6 Textiles](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-6-6-textiles.md) - [1.6.7 Textile Types: Fibres](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-6-7-textile-types-fibres.md) - [1.6.8 Textile Types: Weave](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-6-8-textile-types-weave.md) - [1.6.9 Paper & Boards](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-6-9-paper-and-boards.md) - 1.7 Material Properties - [1.7.1 Physical & Working Properties](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-7-1-physical-and-working-properties.md) - [1.7.2 End of Topic Test - Materials](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-7-2-end-of-topic-test-materials.md) - [1.7.3 Exam-Style Questions - Materials](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/1-7-3-exam-style-questions-materials.md) ### 2 Paper & Board: Specialist Technical Principles - 2.1 Selection of Materials - [2.1.1 Paper & Boards](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-1-1-paper-and-boards.md) - [2.1.2 Working with Paper & Boards](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-1-2-working-with-paper-and-boards.md) - 2.2 Paper & Board: Forces & Stresses - [2.2.1 Paper & Board: Forces & Stresses](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-2-1-paper-and-board-forces-and-stresses.md) - [2.2.2 Cardboard & Paper](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-2-2-cardboard-and-paper.md) - 2.3 Paper & Board: Ecological & Social Footprint - [2.3.1 Paper & Board: Ecological & Social Footprint](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-3-1-paper-and-board-ecological-and-social-footprint.md) - [2.3.2 Paper & Board: The Six Rs](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-3-2-paper-and-board-the-six-rs.md) - [2.3.3 Social Issues](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-3-3-social-issues.md) - 2.4 Paper & Board: Sources & Origins - [2.4.1 Paper & Board](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-4-1-paper-and-board.md) - [2.4.2 End of Topic Test - Paper & Board](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-4-2-end-of-topic-test-paper-and-board.md) - 2.5 Paper & Board: Using Materials - [2.5.1 Paper & Board: Properties of Materials](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-5-1-paper-and-board-properties-of-materials.md) - [2.5.2 Paper & Board: Modification of Materials](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-5-2-paper-and-board-modification-of-materials.md) - [2.5.3 Paper & Board: Shape & Form](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-5-3-paper-and-board-shape-and-form.md) - 2.6 Paper & Board: Stock Forms, Types & Sizes - [2.6.1 Paper & Board: Forms](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-6-1-paper-and-board-forms.md) - [2.6.2 Paper & Board: Types](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-6-2-paper-and-board-types.md) - [2.6.3 Paper & Board: Sizes](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-6-3-paper-and-board-sizes.md) - [2.6.4 Paper & Board: Standards Components](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-6-4-paper-and-board-standards-components.md) - 2.7 Paper & Board: Scales of Production - [2.7.1 Paper & Board: Scales of Production](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-7-1-paper-and-board-scales-of-production.md) - [2.7.2 Exam-Style Questions - Scales of Production](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-7-2-exam-style-questions-scales-of-production.md) - 2.8 Paper & Board: Specialist Techniques & Processes - [2.8.1 Paper & Board: Techniques & Processes](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-8-1-paper-and-board-techniques-and-processes.md) - [2.8.2 Paper & Board: Quality Control](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-8-2-paper-and-board-quality-control.md) - 2.9 Paper & Board: Surface Treatments & Finishes - [2.9.1 Paper & Board: Surface Treatments & Finishes](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-9-1-paper-and-board-surface-treatments-and-finishes.md) - [2.9.2 End of Topic Test - Specialist Techniques](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/2-9-2-end-of-topic-test-specialist-techniques.md) ### 3 Timber: Specialist Technical Principles - 3.1 Timber: Selection of Materials - [3.1.1 Timber Based Materials](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-1-1-timber-based-materials.md) - [3.1.2 Timber: Environment & Ethics](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-1-2-timber-environment-and-ethics.md) - 3.2 Timber: Forces & Stresses - [3.2.1 Timber: Forces & Stresses](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-2-1-timber-forces-and-stresses.md) - [3.2.2 Timber](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-2-2-timber.md) - 3.3 Timber: Ecological & Social Footprint - [3.3.1 Timber: Ecological & Social Footprint](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-3-1-timber-ecological-and-social-footprint.md) - [3.3.2 Timber: The Six Rs](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-3-2-timber-the-six-rs.md) - [3.3.3 Timber: Social Issues](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-3-3-timber-social-issues.md) - [3.3.4 Exam-Style Questions - Timber](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-3-4-exam-style-questions-timber.md) - 3.4 Timber: Sources & Origins - [3.4.1 Timber](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-4-1-timber.md) - [3.4.2 Timber: Processing & Seasoning](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-4-2-timber-processing-and-seasoning.md) - [3.4.3 Manufactured Board](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-4-3-manufactured-board.md) - [3.4.4 End of Topic Test - Timber](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-4-4-end-of-topic-test-timber.md) - 3.5 Timber: Using Materials - [3.5.1 Timber: Properties of Materials](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-5-1-timber-properties-of-materials.md) - [3.5.2 Timber: Modification of Materials](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-5-2-timber-modification-of-materials.md) - [3.5.3 Timber: Shape & Form](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-5-3-timber-shape-and-form.md) - [3.5.4 Timber: Shape & Form 2](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-5-4-timber-shape-and-form-2.md) - 3.6 Timber: Stock Forms, Types & Sizes - [3.6.1 Timber: Stock Forms, Types & Sizes](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-6-1-timber-stock-forms-types-and-sizes.md) - 3.7 Timber: Scales of Production - [3.7.1 Timber: Scales of Production](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-7-1-timber-scales-of-production.md) - 3.8 Timber: Specialist Techniques & Processes - [3.8.1 Timber: Tools, Equipment & Processes](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-8-1-timber-tools-equipment-and-processes.md) - [3.8.2 Timber: Tools, Equipment & Processes 2](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-8-2-timber-tools-equipment-and-processes-2.md) - [3.8.3 Timber: Quality Control](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-8-3-timber-quality-control.md) - 3.9 Timber: Surface Treatments & Finishes - [3.9.1 Timber: Surface Treatments](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-9-1-timber-surface-treatments.md) - [3.9.2 Timber: Finishes](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-9-2-timber-finishes.md) - [3.9.3 End of Topic Test - Specialist Techniques](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/3-9-3-end-of-topic-test-specialist-techniques.md) ### 4 Metal: Specialist Technical Principles - 4.1 Metals: Selection of Materials - [4.1.1 Metal-Based Materials](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-1-1-metal-based-materials.md) - [4.1.2 Ferrous Metals](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-1-2-ferrous-metals.md) - [4.1.3 Non-Ferrous Metals](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-1-3-non-ferrous-metals.md) - [4.1.4 Alloys](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-1-4-alloys.md) - [4.1.5 Metals: Environment & Ethics](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-1-5-metals-environment-and-ethics.md) - 4.2 Metals: Forces & Stresses - [4.2.1 Metals: Forces & Stresses](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-2-1-metals-forces-and-stresses.md) - 4.3 Metals: Ecological & Social Footprint - [4.3.1 Metals: Ecological Footprint](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-3-1-metals-ecological-footprint.md) - [4.3.2 Metals: Social Footprint](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-3-2-metals-social-footprint.md) - [4.3.3 Metals: The Six R's](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-3-3-metals-the-six-rs.md) - [4.3.4 Metals: Social Issues](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-3-4-metals-social-issues.md) - 4.4 Metals: Sources & Origins - [4.4.1 Origins of Metal](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-4-1-origins-of-metal.md) - [4.4.2 Processing Metals](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-4-2-processing-metals.md) - 4.5 Metals: Alloy-Based Materials - [4.5.1 Types of Metal Alloys](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-5-1-types-of-metal-alloys.md) - [4.5.2 Alloying Elements](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-5-2-alloying-elements.md) - [4.5.3 Properties & Benefits](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-5-3-properties-and-benefits.md) - [4.5.4 Processing & Fabrication](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-5-4-processing-and-fabrication.md) - [4.5.5 Applications of Alloys](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-5-5-applications-of-alloys.md) - [4.5.6 Metal Alloys in Industry](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-5-6-metal-alloys-in-industry.md) - [4.5.7 Applications of Metal Alloys](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-5-7-applications-of-metal-alloys.md) - 4.6 Metals: Using Materials - [4.6.1 Properties of Metals](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-6-1-properties-of-metals.md) - [4.6.2 Modification of Metals](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-6-2-modification-of-metals.md) - [4.6.3 Metals: Shape & Form](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-6-3-metals-shape-and-form.md) - 4.7 Metals: Scales of Production - [4.7.1 Metals: Scales of Production](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-7-1-metals-scales-of-production.md) - 4.8 Metals: Specialist Techniques & Processes - [4.8.1 Metals: Tools](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-8-1-metals-tools.md) - [4.8.2 Metals: Tools & Equipment](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-8-2-metals-tools-and-equipment.md) - [4.8.3 Metals: Cutting, Forming & Machining Processes](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-8-3-metals-cutting-forming-and-machining-processes.md) - [4.8.4 Metals: Joining, Casting & Heat Treatment Process](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-8-4-metals-joining-casting-and-heat-treatment-process.md) - 4.9 Metals: Quality Control - [4.9.1 Metals: Quality Control](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-9-1-metals-quality-control.md) - [4.9.2 Metals: Quality Control Processes](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-9-2-metals-quality-control-processes.md) - 4.10 Metals: Surface Treatments & Finishes - [4.10.1 Metals: Surface Treatments](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-10-1-metals-surface-treatments.md) - [4.10.2 Metals: Surface Treatments for Metals](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-10-2-metals-surface-treatments-for-metals.md) - [4.10.3 Metals: Finishes](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-10-3-metals-finishes.md) - [4.10.4 Metals: Finishing Techniques for Metals](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/4-10-4-metals-finishing-techniques-for-metals.md) ### 5 Polymers: Specialist Technical Principles - 5.1 Polymers - [5.1.1 Polymers: Functionality & Aesthetics](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/5-1-1-polymers-functionality-and-aesthetics.md) - [5.1.2 Polymers: Environment & Ethics](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/5-1-2-polymers-environment-and-ethics.md) - [5.1.3 Polymers: Sources, Origins & Properties](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/5-1-3-polymers-sources-origins-and-properties.md) - [5.1.4 Polymers: Forces & Stresses](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/5-1-4-polymers-forces-and-stresses.md) - [5.1.5 Polymers: Ecological & Social Footprint](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/5-1-5-polymers-ecological-and-social-footprint.md) - [5.1.6 Polymers: The Six R's](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/5-1-6-polymers-the-six-rs.md) - 5.2 Polymer Categories - [5.2.1 Categories of Polymers](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/5-2-1-categories-of-polymers.md) - [5.2.2 Thermoforming Polymers](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/5-2-2-thermoforming-polymers.md) - [5.2.3 Thermosetting Polymers](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/5-2-3-thermosetting-polymers.md) - 5.3 Polymer Forms - [5.3.1 Polymers: Stock Forms](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/5-3-1-polymers-stock-forms.md) - [5.3.2 Polymers: Shape & Form](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/5-3-2-polymers-shape-and-form.md) - 5.4 Polymer Production, Techniques & Quality Control - [5.4.1 Polymers: Scales of Production](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/5-4-1-polymers-scales-of-production.md) - [5.4.2 Polymers: Specialist Techniques & Processes](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/5-4-2-polymers-specialist-techniques-and-processes.md) - [5.4.3 Polymers: Quality Control Systems: Tolerance](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/5-4-3-polymers-quality-control-systems-tolerance.md) - [5.4.4 Polymers: Finishes](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/5-4-4-polymers-finishes.md) ### 6 Textiles: Specialist Technical Principles - 6.1 Textile Materials - [6.1.1 Origin of Textiles](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/6-1-1-origin-of-textiles.md) - [6.1.2 Textile Industry](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/6-1-2-textile-industry.md) - 6.2 Selection of Materials - [6.2.1 Natural Fibres](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/6-2-1-natural-fibres.md) - [6.2.2 Synthetic Fibres](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/6-2-2-synthetic-fibres.md) - [6.2.3 Environmental Concerns](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/6-2-3-environmental-concerns.md) - [6.2.4 Environmental Impact](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/6-2-4-environmental-impact.md) - [6.2.5 Ethical Challenges](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/6-2-5-ethical-challenges.md) - 6.3 Forces & Stresses - [6.3.1 Forces & Stresses](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/6-3-1-forces-and-stresses.md) - 6.4 Ecological & Social Footprint - [6.4.1 Ecological Footprint](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/6-4-1-ecological-footprint.md) - [6.4.2 Social Footprint](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/6-4-2-social-footprint.md) - [6.4.3 Addressing Ecological & Social Footprints](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/6-4-3-addressing-ecological-and-social-footprints.md) - [6.4.4 The Six R's](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/6-4-4-the-six-rs.md) - [6.4.5 Labour Conditions](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/6-4-5-labour-conditions.md) - [6.4.6 Social Issues](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/6-4-6-social-issues.md) - [6.4.7 Addressing Social Issues](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/6-4-7-addressing-social-issues.md) ### 7 Designing & Making Principles - 7.1 Investigation & Data - [7.1.1 Iterative Design](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-1-1-iterative-design.md) - [7.1.2 Primary & Secondary Data](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-1-2-primary-and-secondary-data.md) - [7.1.3 Market Research](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-1-3-market-research.md) - [7.1.4 Ergonomics](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-1-4-ergonomics.md) - [7.1.5 Specifications](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-1-5-specifications.md) - [7.1.6 End of Topic Test - Investigation & Data](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-1-6-end-of-topic-test-investigation-and-data.md) - [7.1.7 Exam-Style Questions - Specifications](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-1-7-exam-style-questions-specifications.md) - 7.2 Environmental, Social & Economic Challenges - [7.2.1 Challenges](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-2-1-challenges.md) - [7.2.2 Your Research](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-2-2-your-research.md) - 7.3 The Work of Others - [7.3.1 Designers](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-3-1-designers.md) - [7.3.2 Architects](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-3-2-architects.md) - [7.3.3 Product Design](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-3-3-product-design.md) - [7.3.4 Industrial Designers](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-3-4-industrial-designers.md) - [7.3.5 Product Design Companies](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-3-5-product-design-companies.md) - [7.3.6 Textile Design Companies](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-3-6-textile-design-companies.md) - [7.3.7 End of Topic Test - The Work of Others](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-3-7-end-of-topic-test-the-work-of-others.md) - 7.4 Design Strategies - [7.4.1 Design Strategies](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-4-1-design-strategies.md) - 7.5 Communication of Design Ideas - [7.5.1 Design Communication](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-5-1-design-communication.md) - 7.6 Prototype Development - [7.6.1 Prototype Development](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-6-1-prototype-development.md) - 7.7 Selection of Materials - [7.7.1 Materials](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-7-1-materials.md) - 7.8 Tolerances - [7.8.1 Tolerances](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-8-1-tolerances.md) - 7.9 Material Management - [7.9.1 Managing Material](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-9-1-managing-material.md) - [7.9.2 Tools](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-9-2-tools.md) - 7.10 Specialist Equipment - [7.10.1 Health & Safety](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-10-1-health-and-safety.md) - 7.11 Specialist Techniques & Processes - [7.11.1 Specialist Techniques & Processes](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-11-1-specialist-techniques-and-processes.md) - [7.11.2 Surface Finishes](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-11-2-surface-finishes.md) - [7.11.3 End of Topic Test - Designing & Making](https://senecalearning.com/en-gb/revision-notes/gcse/design-and-technology/aqa/7-11-3-end-of-topic-test-designing-and-making.md)