The Edisonian approach to innovation is characterized by trial and error

Trial and error

Trial and error, or trial by error, is a general method of problem solving, fixing things, or for obtaining knowledge."Learning doesn't happen from failure itself but rather from analyzing the failure, making a change, and then trying again."...

 discovery rather than a systematic theoretical approach. This may be a convenient term, but it is an inaccurate and misleading description of the method of invention actually used by Thomas Edison

Thomas Edison

Thomas Alva Edison was an American inventor and businessman. He developed many devices that greatly influenced life around the world, including the phonograph, the motion picture camera, and a long-lasting, practical electric light bulb. In addition, he created the world’s first industrial...

. An often quoted example of the Edisonian approach is the successful but protracted process he is said to have used to invent a practical incandescent light bulb

Incandescent light bulb

The incandescent light bulb, incandescent lamp or incandescent light globe makes light by heating a metal filament wire to a high temperature until it glows. The hot filament is protected from air by a glass bulb that is filled with inert gas or evacuated. In a halogen lamp, a chemical process...

. Trial and error alone cannot account for Edison's success with electric lighting when so many others failed (Friedel and Israel (1987) list 23 others) or his remarkable record of almost 1100 patents (see the list of Edison patents).

The historical record indicates that Edison's approach was much more complex, that he made use of available theories and resorted to trial and error only when no adequate theory existed.

Trial and error (hunt and try)

Based on detailed study of his notebooks a number of scholars have pointed out that Edison generally resorted to trial and error in the absence of adequate theories. For example, in developing the carbon microphone (or carbon grain transmitter) that became the basis of telephones of the next hundred years, Edison and his co-workers tried hundreds of substances, finally settling on lamp black as the variable resistance medium. Edison could not use theory to solve this problem because, as Gorman and Carlson note, at the time "no one had yet developed a chemical theory that Edison could have used to identify a form of carbon with the electrical properties he wanted" (Gorman and Carlson, 1990).

Edison was not alone in using trial and error (more accurately termed by Hughes as "hunt and try") because he, like others, was working at the edges of contemporary theory. Thomas Midgley (who held a PhD and was the inventor of tetraethyl lead and halogenated hydrocarbon refrigerants) said of trial and error, "the trick is to turn a wild goose chase into a fox hunt" (quoted in Hughes 2004).

Such leading edge work requires a combination of theory and empirical approaches. Edison used a "bottom-up theoretical approach" when developing electric lighting, undertaking detailed analysis of the whole electric lighting system based on Joule's and Ohm's laws. This led him to conclude that to be economically successful he had to produce a high resistance lamp (around 100 ohms). (Friedel and Israel 1987) Once he had established the need for a high resistance lamp he was faced with a lack of optical emission theories to describe the behaviour of materials when heated to incandescence. It was then that he embarked on a systematic search for a suitable material and for the techniques to manufacture it in economic volumes.

Edison's method

Historian Thomas Hughes (1977) describes the features of Edison's method. In summary, they are:

• Hughes says, "In formulating problem-solving ideas, he was inventing; in developing inventions, his approach was akin to engineering; and in looking after financing and manufacturing and other post-invention and development activities, he was innovating."
• Edison "Adroitly chose" problems that made use of what he already knew.
• Edison's method was to invent systems rather than components of systems. Edison did not just invent a light bulb, he invented an economically viable system of lighting including its generators, cables, metering and so on.
• Edison invented by repeatedly trying devices in more complex environments to progressively approximate their final use conditions.
• Edison blended invention with economics. His electric lighting system was designed to be an economic competitor with gas lighting.
• Edison assembled and organized the resources that would lead to successful inventions:
  • Men with skills that would aid the task.
  • Equipment – machines, instruments, chemicals etc.
  • Literature on the subject. He started a project with a thorough literature review.
  • An environment where the purpose was invention not something else like manufacturing.
• Edison was a charismatic leader who drew on the ideas of those who worked with him.
• Edison was obsessive in his pursuit of outcomes, not allowing things like a lack of sleep, or cost, to deter him.
• Contrary to common opinion Edison made use of the scientific method but in a way that was limited to the task at hand and did not seek to develop generalized theories.
• A key to Edison's intellectual approach was to always doubt and never take things for granted.
• Edison made effective use of metaphors when picturing his inventions.
• He had a significant ability to grasp quantitative relationships despite his limited mathematical training.
• He worked by conceiving an idea and working towards achieving it.
• Edison (And his co-workers) possessed excellent manual dexterity.
• Edison was also very effective at sketching, enabling him to conceive and manipulate his ideas on paper.
• Edison did use hunt and try extensively but only when no theory existed and in a systematic rather than random manner.
• Edison was distinguished by his ability to deal with complex change.

Edison on literature reviews

Edison is quoted as saying, "When I want to discover something, I begin by reading up everything that has been done along that line in the past - that's what all these books in the library are for. I see what has been accomplished at great labor and expense in the past. I gather data of many thousands of experiments as a starting point, and then I make thousands more."

See also

• Creativity techniques
  Creativity techniques
  Creativity techniques are methods that encourage creative actions, whether in the arts or sciences. They focus on a variety of aspects of creativity, including techniques for idea generation and divergent thinking, methods of re-framing problems, changes in the affective environment and so on. They...
  
  
• The heroic theory of invention and scientific development