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Theory of Inventive Problem Solving (TRIZ) 337
Reduce the number of supporting functions
■ Trim supporting functions and related parts
■ Simplify supporting functions and related parts
■ Use free resources to deliver supporting functions
Techniques to decrease harms
1. Use functional improvement methods to reduce harm
2. Use trimming to reduce harmful functions
3. Use available resources to combat harmful functions
Example 9.33. Using a Pollutant (Waste) to Prevent Pollution To prevent
pollution, exhaust gas from a thermal power station is treated with alkaline
chemicals. The alkaline slag is itself recovered from a coal-burning coal
power station, where the slag had also been a source of pollution. In this
case, the auxiliary function of preventing pollution is realized by using an
existing resource, and a harmful function (pollution) is eliminated.
9.9.2 Increasing complexity followed
by simplification
This evolution trend states that species of a technological system at an
early stage of development will usually deliver only a very simple basic
function with limited capacity, but as the technology matures, the sys-
tem will add more functions with improved capacity in terms of func-
tion quality and quantity. The system will also add more components
and become more complex, and further down the road of development,
the system structure will improve, which means a reduced number of
components, reduced complexity, and better use of space, material, and
other resources, and the process will continue.
This trend is a close relative to the trend of increasing ideality.
Increasing ideality as we described it is featured by “Do more or the
same with less.” The trend of increasing functionality and enhanced
structures is featured by “Do more, spend more, and then consolidate,
simplify, and spend less.”
9.9.3 Nonuniform development
of system elements
For a complex system with many components and subsystems, the evo-
lution of the system will be also featured by nonuniform development
of system elements:
