Test project :A4 Pap:A4 Use the instruction interface to test the appearance and functionality of : paper: Can you writ: paper be natural? Will it scratch your hand? Reliability: Will it scratch when writing? Transplantability: Can the paper be used normally in different places, temperatures and other environments? Compatibility: Can it be written with multiple pens and colors? Can it be used for printing? Ease of use of origami: Is the paper rough? Can it be written smoothly? User documentation: Does the user manual describe the usage, restrictions and conditions of use of the paper in detail? Load test: Drop a drop of ink. See if it will soak in the pressure test: write hard to see if it will wear a stack of pap: and vibrate on six sides, and check whether the product can cope with the bad railway/highway/aviation test data: which are applied to: equivalence class division method, boundary value method, causality chart method, wrong guess method and so on.