1. Usability
1.1. Does it convenient to write?
1.2. Doesn't it slide in hand?
1.3. Can it be put behind an ear and will it hold?
1.4. Can it be placed in a bag?
2. Perfomance
2.1. How long can it write after it sharpened?
2.2. How fast can eraser erase what is written with a pencil?
2.3. How long it takes to sharpen a pencil?
2.3.1. With handheld pencil sharpener
2.3.2. With knife
2.3.3. With automatic pencil sharpener
2.3.4. With stationery knife
3. Security
3.1. Can eat an eraser/the lead/wooden part?
3.2. Wooden part can hurt a user?
4. UI
4.1. Does it have marking?
4.2. What is the color of wooden part?
4.3. Does it have barcode?
5. Validation
5.1. Can use at any time?
5.1.1. Day
5.1.2. Night
5.2. Can use in any environment?
5.2.1. Home
5.2.2. Space
5.2.3. Office
5.3. Can use in sunny/rainy weather?
6. Negative
6.1. Taste it
6.2. Break it down on slices
6.2.1. Can sharpen it again?
6.3. Put in water
6.4. Use as a weapon for self-defence
6.5. Use eraser to erase what is written with a pen
6.6. Sharpen the lead and wooden part separately
6.7. Cut in half lengthwise, glue it again, does it write?
6.8. A few users can use one pencil concurrently?
7. Stress
7.1. Press on the pencil's lead while writing hard with a hand
7.2. Drop it down from 2 m height
7.3. Hold it with wet/sweaty hands
7.3.1. Does the paint on wooden part sticks to hands?
7.4. Try to bend a pencil
8. Functional
8.1. Does it write?
8.1.1. Is the strength of the lead 2B?
8.2. Can it be sharpened?
8.2.1. From one side
8.2.2. From other side
8.2.3. From both sides
8.3. What color does it write?
8.4. Does an eraser erase what you write with a pencil?
8.4.1. Eraser on pencil
8.4.1.1. Erase what is written with other pencil?
8.4.2. Other erasers
9. Levels
9.1. Unit
9.1.1. Check the lead in the pencil
9.1.2. Check the wooden part
9.1.3. Check the eraser
9.2. Integration
9.2.1. Check how connected modules interact
9.2.1.1. The lead and wooden part
9.2.1.2. Wooden part and eraser
9.2.1.3. The lead and eraser
9.3. System
9.3.1. Connect all modules together
9.4. Acceptance
9.4.1. UAT
9.4.1.1. Give a pencil to a user to test
9.4.2. Contractual and regulatory
9.4.2.1. Verify it satisfies contractual and regulatory standards (for country where it will be used)
10. Verification
10.1. Does it have all needed modules?
10.2. What is the shape?
10.3. Check the length
10.4. Verify pencil hardness
11. Compability
11.1. What surface can it write on?
11.1.1. Paper
11.1.1.1. Formats A0-A10
11.1.1.2. Types
11.1.1.2.1. Bond paper
11.1.1.2.2. Gloss coated paper
11.1.1.2.3. Recycled paper
11.1.1.2.4. Uncoated paper
11.1.1.2.5. Watermarked paper
11.1.1.2.6. Silk paper
11.1.1.3. Density
11.1.1.3.1. 35-350 gsm
11.1.2. Wood
11.1.3. Brick
11.1.4. Glass
11.1.5. Metal
11.2. Can be sharpened with?
11.2.1. With knife
11.2.2. With handheld pencil sharpener
11.2.3. With automatic pencil sharpener
11.2.4. With stationery knife
11.2.5. With sword
11.3. Can hold in?
11.3.1. Bag
11.3.2. Pencil box
11.3.3. Pencil holder