Table 4. TRIZ principles

No. Principle No. Principle
1 Segmentation 21 Skipping
2 Taking out 22 Blessing in disguise
3 Local quality 23 Feedback
4 Asymmetry 24 Intermediary
5 Merging 25 Self service
6 Universality 26 Copying
7 Nesting 27 Cheap short living object
8 Counterweight 28 Mechanic substitution
9 Preliminary anti-action 29 Pneumatic and hydraulic
10 Preliminary action 30 Flexible shell and thin film
11 Cushion in advance 31 Porous material
12 Equipotentiality 32 Color change
13 Inversion 33 Homogeneity
14 Spheroidality-curvature 34 Discarding and recovering
15 Dynamicity 35 Parameter change
16 Partial or excessive action 36 Phase transition
17 Transition into a new dimension 37 Thermal expansion
18 Mechanical vibration 38 Strong oxidants
19 Periodic action 39 Inert atmosphere
20 Continuity of useful action 40 Composite material
TRIZ: theory of solving problems inventively.