# The Seventy-Six Standard Solutions: How They Relate to the 40 Principles of Inventive Problem Solving

| On 20, May 1999

Ellen Domb, John Terninko, john@terninko.comJoe Miller, jam@mcs.netEllen MacGran, emacgran@aol.com

The “76 Standard Solutions” of TRIZ were compiled by G.S. Altshuller and his associates between 1975 and1985. They are grouped into 5 large categories as follows:

 1. Improving the system with no or little change 13 standard solutions 2. Improving the system by changing the system 23 standard solutions 3. System transitions 6 standard solutions 4. Detection and measurement 17 standard solutions 5. Strategies for simplification and improvement 17 standard solutions Total: 76 standard solutions

(References 1-5)

Careful examination of the lists in these references shows 86 items, although they have been traditionally called the “76 Standard Solutions.” For examples, standardsolution 1.1.8 has two distinctly different parts:

• 1.1.8.1: If an effect is required to be strong in certain areas and weak or non-existent in others, and the field to be used is strong, then a shielding substance should be used to protect the areas where no effect is desired.
• 1.1.8.2. If an effect is required to be strong in certain areas and weak or non-existent in others, and the field is weak, then a substance that reacts with the field to produce the effect should be used in the areas where the strong effect is needed.

In the table below, these are treated as separate “standard solutions.”Likewise, standard solution 5.1.1. has either eight or nine parts, depending on whichreference is used, and they are all treated separately in this table.

The 76 Standard Solutions are generally taught in conjunction with the Su-field models,since in many of the standard problems that are solved by the standard solutions aredefined in terms of their Su-field models.

Meanwhile, the 40 Principles for Inventive Problem Solving remain one of the mostpopular tools of TRIZ, partly because of their longevity (developed between the lateâ€˜40â€™s and 1972) and partly because of their availability in English (References.) Their popularity is enhanced by easy availabilityâ€”they appear in commercialsoftware, textbooks, and through free distribution on the world wide Web (reference 1,2,6-10.)

Table 1 is a list of the 40 principles with the correlation to the 76 StandardSolutions. We invite readers to send letters to the editor or articles(editor@the-trizjournal.com) with examples of the actual use of either the 76 StandardSolutions or the 40 Principles on contemporary problems.

 Table 1. Mapping the 76 standard solutions onto the 40 inventive principles in TRIZ

Principle Standard solution