Farhan Al Shammari*
TRIZ: Inventive Problem Solving- 4

In this fourth article of our TRIZ series, we will go through the principles 21 to 30 as previously illustrate principles 1 to 20 let us continue the journey.

Principle 21: Rushing Through, Skipping 

Implementation of specific operations very fast to avoid possible negative effects


• Rescue someone from drowning at sea

• Operations performed in emergency by doctors

Principle 22: Convert Harm to Benefit

Use of harmful elements or effects in the system to obtain positive effects

The harmful effects can also be eliminated by adding harmful substances to produce a useful or harmless product.


• Use of waste to generate electric power

• Weapons and anti-arms industry

Principle 23: Feedback

Providing information to a product with the aim of improving that product or improving the procedures it performs, as there is feedback is present, So, its quality or process can be enhanced


• Airport metal detector

• Speed bell

• Anti-theft alarm for cars and homes

Principle 24: Mediator/ Intermediary

The use of an intermediary object, system, or process to perform work, or temporarily combine something to achieve a specific target.


• The blacksmith needs to join two pieces together and needs a medium to weld them together

• Using needles to enter medical solutions

Principle 25: Self-Service

Making the system self-serve by performing support functions such as maintenance, handling differences, and using wasted resources


• Laser Doors that operate open automatically

• Autopilot

Principle 26: Copying

Using a copy of the thing or system is simpler and more expensive and can be reduced or enlarged as needed

Instead of an unavailable, expensive, fragile object, use simpler and inexpensive copies.

Replace an object, or process with optical copies.

We could copy the design of abbreviated scuba diving wet suits for use as a bullet proof garment.


• Gold and mobile stores offer copies, not original goods

• Listening to lectures from net instead of direct attendance

Principle 27: Cheap Short-Living Objects

Replace an inexpensive object with a multiple of inexpensive objects, comprising certain qualities.


• Plastic utensils in restaurants

• The tent instead of the room.

Principle 28: Replacement of mechanical system

Replacing mechanical means with sensory ones (auditory - visual - tasting- olfactory) and using electric, magnetic and electromagnetic fields to interact with events

Transition from stationary to moving fields, and from irregular to regular fields


• To detect narcotics, the search is by a mechanical machine, such as metal detectors, etc., or by manual searches. Using this principle, sniffer dogs are trained to detect narcotics.

• Eye or ear prints to detect thefts instead of fingerprints

Principle 29: Pneumatic or Hydraulic Construction

Replacing the solid state in the body or system with liquid or gas, that is, by swelling these things with water and air


• Scouts and armies carry tents and beds - plastic that inflate when sleeping

• Use of an inflatable lifeboat

• Children's pools that inflate when needed

Principle 30: Flexible Membranes/Thin Films

The use of flexible membranes and thin films instead of 3D systems, and the object can also be isolated from its surroundings using membranes and thin films


• Sunglasses

• Adding a thin layer to the glass with even if it breaks - will cohesive and does not cause damage


Farhan Hassan Al Shammari

Twitter: @farhan_939

E-mail: fhshasn@gmail.com

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