Design & Technology (D&T) in the Junior Secondary Grade 9 ECZ curriculum introduces candidates to engineering graphics, material science, workshop processes, and design problem-solving. This revision guide breaks down technical drawing and workshop fundamentals for exam success.
For Grade 9 Candidates
D&T requires sharp drawing skills as well as theoretical knowledge! Keep your 2H pencil sharp for thin construction lines and use HB pencils for final object outlines.
1. Technical Drawing & Orthographic Projection
First Angle vs Third Angle Projection
Orthographic projection presents 3D objects as 2D orthographic views:
- Front Elevation: The view seen looking directly at the front of the object.
- Plan View: The top-down view looking directly from above.
- End Elevation: The side view looking from the left or right side.
- Standard Symbols: Always practice recognizing the standard projection truncated cone symbol required on ECZ drawing sheets!
2. Materials and Working Properties
Grade 9 D&T syllabus categorizes raw materials into three primary groups:
A. Timber (Wood)
- Hardwoods: Deciduous trees (broad-leaved) such as Mukwa, Teak, and Mahogany. Dense, durable, and used for high-end furniture.
- Softwoods: Coniferous trees (evergreen/needle leaves) such as Pine and Cedar. Fast-growing, lighter, and easier to work with.
- Manufactured Boards: Plywood, Blockboard, and MDF (Medium Density Fibreboard). Available in large flat sheets resistant to warping.
B. Metals
- Ferrous Metals: Contain iron, magnetic, vulnerable to rust (e.g., Mild Steel, Cast Iron).
- Non-Ferrous Metals: Contain no iron, non-magnetic, corrosion resistant (e.g., Aluminum, Copper, Brass).
C. Plastics
- Thermoplastics: Can be re-heated and re-shaped multiple times (e.g., Acrylic, PVC, Polyethene).
- Thermosetting Plastics: Once set by heat, cannot be re-melted (e.g., Bakelite, Formica, Epoxy resin).
Tool Identification Practice
Practice identifying common tools by name and function: Mortise chisel (cutting deep joints), Marking gauge (drawing lines parallel to timber edges), Centre punch (marking metal before drilling).
3. Design Process & Problem Solving
In Section B design questions, candidates are presented with a practical problem and asked to propose a solution:
- Design Brief: Concise statement of the problem to be solved.
- Specification: Detailed requirements (size, safety, material cost, durability).
- Idea Sketches: Neat 3D isometric or oblique sketches showing proposed designs with annotations.
- Evaluation: Testing whether the final design meets all original specifications.
Teacher Tip
Encourage learners to practice drawing isometric cubes on grid paper to master 30° isometric sketching quickly without a ruler during exams.
Frequently Asked Questions
Q1: What is the difference between First Angle and Third Angle Orthographic Projection?
In First Angle projection, the Plan view is drawn BELOW the Front Elevation, and the Right End Elevation is drawn on the LEFT. In Third Angle projection, the Plan view is drawn ABOVE the Front Elevation, and views remain on their respective sides.
Q2: What materials are tested in Grade 9 ECZ Design & Technology?
D&T tests working properties of Hardwoods (e.g., Mukwa, Rosewood) and Softwoods (e.g., Pine), Ferrous metals (containing iron) vs. Non-Ferrous metals (copper, aluminum), and Thermoplastics vs. Thermosetting plastics.
Q3: What drawing instruments are mandatory for the D&T paper?
Candidates must bring HB and 2H pencils, a T-square, 30°/60° and 45° set-squares, a pair of compasses, a protractor, a clear ruler, and an eraser.
Master Grade 9 D&T with ECZ Solutions
Download past drawing questions, tool identification charts, and orthographic projection worksheets.
Download D&T Resources