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The Power of Brain Storming:
Divergent/Convergent Processes

©Herb Stevenson
August 24, 2017

The Origin of Brainstorming

Advertising executive Alex F. Osborn began developing methods for creative problem-solving in 1939. He was frustrated by employees’ inability to develop creative ideas individually for ad campaigns. In response, he began hosting group-thinking sessions and discovered a significant improvement in the quality and quantity of ideas produced by employees. He found that conventional business meetings were inhibiting the creation of new ideas and proposed some rules designed to help stimulate them. He was looking for rules which would give people the freedom of mind and action to spark off and reveal new ideas. To "think up" was originally the term he used to describe the process he developed, and that in turn came to be known as "brainstorming". He described brainstorming as "a conference technique by which a group attempts to find a solution for a specific problem by amassing all the ideas spontaneously by its members". His underlying premise was that “it is easier to tone down a wild idea than to think up a new one.”

A co-founder of worldwide advertising agency BBDO, Osborn went on to author several theories of creativity, culminating in the creation the Creative Education Foundation. But his foray into pedagogy began back in 1921 with A Short Course in Advertising, his first book in which he explored the principles of the advertising business. Yet it wasn’t until 1942 with the publishing of How to Think Up that the so-called “father of brainstorming” established himself as a foremost philosopher in applied creativity. Later books included Wake Up Your Mind: 101 Ways to Develop Creativeness (1952), Your Creative Power: How to Use Imagination (1952), Applied Imagination (1953), and How to Become More Creative (1964).

Osborn held the underlying belief that everyone had creative potential; all that was needed was a process to teach and nurture it. “Creativity is more than mere imagination,” he proclaimed. “It is imagination inseparably coupled with both intent and effort.” He accessed that intent and effort through brainstorming, a technique that relied on two ideals: the separation of imaginative and judicial judgment; and the principle of suspending judgment. When imagination and judgement are separated and judgement suspended, the imagination can work freely, which provides the foundation for his theory that “quantity will breed quality.”

Original Rules for Brain Storming

The rules he came up with are the following:

He found that when these rules were followed, a lot more ideas were created and that a greater quantity of original ideas gave rise to a greater quantity of useful ideas. Quantity produced quality (when judgement is suspended).

Using these new rules, people's natural inhibitions were reduced, inhibitions which prevented them putting forward ideas which they felt might be considered "wrong" or "stupid". Osborn also found that generating "silly" ideas could spark off very useful ideas because they changed the way people thought.

The Osborn Checklist: A Creativity Method from the Originator of Brainstorming

Osborn outlined his method in the 1948 book Your Creative Power in chapter 33, "How to Organize a Squad to Create Ideas" where he laid out the parameters for traditional or classical brainstorming:

  1. Arrange the meeting for a group of the right size and makeup (typically four to eight people).
  2. Write the initial topic on a newsprint/flipchart, whiteboard or other system where everyone can see it. The better defined, and more clearly stated the problem, the better the session tends to be.
  3. Make sure that everyone understands the problem or issue.
  4. Review the ground rules. Avoid criticizing ideas and suspend judgement. All ideas are as valid as each other. A large number of ideas is the aim, if you limit the number of ideas people will start to judge the ideas and only put in their “best” or often, the least radical and new. Don’t censor any ideas, keep the meeting flow going. Listen to other ideas, and try to piggy back on them to other ideas. Avoid any discussion of ideas or questions, as these stop the flow of ideas.
  5. Have someone facilitating to enforce the rules and write down all the ideas as they occur (the scribe can be a second person) Generate ideas, either in an unstructured way (anyone can say an idea at any time) or structure (going around the table, allowing people to pass if they have no new ideas).
  6. Clarify and conclude the session. Ideas that are identical can be combined, all others should be kept. It is useful to get a consensus of which ideas should be looked at further or what the next action and timescale is.

Above all, Osborn emphasized the importance of positive reinforcement: “Creativity is so delicate a flower that praise tends to make it bloom while discouragement often nips it at the bud.”

“Creativity is not something we can turn on and off like a faucet,” he continued. “It is an experience and expression in our lives that must be nurtured. This nurturing process means that creativity is at once a skill, an art, and a lifestyle.”

Facilitation: How to turn it on?

To run a group brainstorming session effectively, follow these steps.

Step 1: Prepare the Group

First, set up a comfortable meeting environment for the session. Make sure that the room is well-lit and that you have the tools, resources, and refreshments that you need.

How much information or preparation does your team need to brainstorm solutions to your problem? Remember that prep is important, but too much can limit – or even destroy – the freewheeling nature of a brainstorming session.

Consider who will attend the meeting. A room full of like-minded people won't generate as many creative ideas as a diverse group, so try to include people from a wide range of disciplines, and include people who have a variety of different thinking styles.

When everyone is gathered, appoint one person to record the ideas that come from the session. This person shouldn't necessarily be the team manager – it's hard to record and contribute at the same time. Post notes where everyone can see them, such as on flip charts or whiteboards; or use a computer with a data projector.

If people aren't used to working together, consider using an appropriate warm-up exercise, or an icebreaker.

Step 2: Present the Problem

Clearly define the problem that you want to solve, and lay out any criteria that you must meet. Make it clear that that the meeting's objective is to generate as many ideas as possible.

Give people plenty of quiet time at the start of the session to write down as many of their own ideas as they can. Then, ask them to share their ideas, while giving everyone a fair opportunity to contribute.

Step 3: Guide the Discussion

Once everyone has shared their ideas, start a group discussion to develop other people's ideas, and use them to create new ideas. Building on others' ideas is one of the most valuable aspects of group brainstorming.

Encourage everyone to contribute and to develop ideas, including the quietest people, and discourage anyone from criticizing ideas.

As the group facilitator, you should share ideas if you have them, but spend your time and energy supporting your team and guiding the discussion. Stick to one conversation at a time, and refocus the group if people become sidetracked.

Although you're guiding the discussion, remember to let everyone have fun while brainstorming. Welcome creativity, and encourage your team to come up with as many ideas as possible, regardless of whether they're practical or impractical. Don't follow one train of thought for too long. Make sure that you generate a good number of different ideas, and explore individual ideas in detail. If a team member needs to "tune out" to explore an idea alone, allow them the freedom to do this.

Also, if the brainstorming session is lengthy, take plenty of breaks so that people can continue to concentrate.

The Next Step – Taking Action

After your individual or group brainstorming session, you'll have a lot of ideas. Although it might seem hard to sort through these ideas to find the best ones, analyzing these ideas is an important next step, and you can use several tools to do this.

Use Affinity Diagrams to organize ideas and find common themes1.


It was believed that by stimulating different ways of looking at the problems, new ways of thinking could be developed. Hence, it was suggested the teams work through the Osborn Checklist. The original list to access the creativity is below. It has been reduced in one form by the SCAMPER questions and by other groups to six critical components by some advocates as shown in the diagram below.

Ask, as applicable:

  1. Can we Put to other uses? As it is? If modified?
  2. Adapt? Is there anything else like this? What does this tell you? Is the past comparable?
  3. Modify? Give it a new angle? Alter the color, sound, odor, meaning, motion, and shape?
  4. Magnify? Can anything be added, time, frequency, height, length, strength? Can it be duplicated, multiplied or exaggerated?
  5. Minify? Can anything be taken away? Made smaller? Lowered? Shortened? Lightened? Omitted? Broken up?
  6. Substitute? Different ingredients used? Other material? Other processes? Another place? Other approach? Other tone of voice? Someone else?
  7. Rearrange? Swap components? Alter the pattern, sequence or layout? Change the pace or schedule? Transpose cause and effect?
  8. Reverse? Opposites? Backwards? Reverse roles? Change shoes? Turn tables? Turn other cheek? Transpose “+/-“?
  9. Combine? Combine units, purposes, appeals or ideas? A blend, alloy, or an ensemble?


A derivation of the Osborn Checklist was later thought up by Bob Eberle (and written by Michael Michalko), known by the acronym SCAMPER:

  1. Substitute – Components, materials, people.
  2. Combine – Mix, combine with other assemblies or services, integrate.
  3. Adapt – Alter, change function, use part of another element.
  4. Modify – Increase or reduce in scale, change shape, modify attributes (e.g. color).
  5. Put to another use.
  6. Eliminate – Remove elements, simplify, reduce to core functionality
  7. Reverse – Turn inside out or upside down.

Whether you utilize the Osborn Checklist or SCAMPER or another creativity method, the most important takeaway is that you give yourself the necessary time and appropriate place to think instead of relying on random moments of inspiration. “If you go fishing you may not catch any fish. If you don’t go fishing, you’ll never catch any fish,” Osborn said. “As in the piling up of hypothetical alternatives, creative accidents follow the law of probabilities the more we fish, the more likely we are to get a strike.”

A further abbreviation is shown below:

Creative Problem-Solving Model

Alex Osborn and his successor, Sidney Parnes, a bright and creative person who followed Osborn as President of CEF, invested nearly 40 years teaching creativity workshops and course and thinking about the creative process, together created the creative problem-solving model. Noteworthy is that every step involves finding, which means the suspension of preconceived ideas and judgements permeates each step. Otherwise, the discovery process will be short-circuited and the ultimate solution will not materialize. Furthermore, it is often presented as five steps, but a preliminary step can be added called mess-finding which involves locating a challenge or problem to which to apply the model. In other words, the first step is problem definition, which from my experience is why many processes fail. They do not ensure that they are solving the correct problem and then have breakdowns in the execution of stage six Acceptance (and Implementation) finding.

The six stages are:

  1. Mess-finding (Objective Finding)
  2. Fact-finding
  3. Problem-Finding
  4. Idea-finding
  5. Solution finding (Idea evaluation)
  6. Acceptance-finding (Idea implementation)

The Osborn-Parnes Creative Problem-Solving Process

The steps guide the creative process. They describe what to do at each immediate step to eventually produce one or more creative, workable solutions. A unique feature is that each step first involves a Divergent thinking phase in which one generates lots of ideas (facts, problem definitions, ideas, evaluation criteria, implementation strategies), and then a convergent phase in which only the most promising ideas are selected for further exploration. Many will recognize the diverge/converge process from the more recent Whole Scale Change methods associated with Bruce Gibb, Al Davenport, Chuck Tyson and Kathy Dannemiller at Dannemiller/Tyson Associates.

The green arrows indicate the divergent process and the blue arrows indicate the convergent process. By creating specific “finding” focus for each of the six steps, the expansiveness of divergent thinking followed by the meaning-making and pattern recognition processes of convergent thinking leads to the indepth creative problem-solving process. In other words, each step of diverge/converge process is within divergence/convergence of the overall creative problem-solving process which leads to the emerging insights for the larger problem-solving.

Divergence and Convergence to Effectuate Change

In creative work, there are two modes of thinking that we use that are very different but are both very useful for different parts of the brain storming process.


Divergence is the process of thinking broadly, of expanding one's mind, of going places where one does not normally go. In fact, it is very much what most people think about when they consider creativity.

Social Variation

Divergent thinking is very important in creativity as the process whereby ideas are generated. Although everyone can do it, some take to it more easily and find idea creation (sometimes called ideation) both natural and fun.

For others, it is something more of an effort, both to create the ideas and to get over the internal blocks that prevent them from telling others about their half-formed ideas. In some cases, the fear of social punishment and ridicule keeps many from even admitting to themselves that they could be good at divergent thinking. Hence, suspending judgement is critical to success

Quantity first

Divergent ideation creates a constant flow of ideas, no matter how good or bad they are (and without even a thought about this), with the knowledge that they will be sorted out in the subsequent convergent activity.


When you have created a big pile of ideas, the creative activity does not stop there. The next stage, which can be very difficult, seeks to thin down the idea set into a very small set of ideas (maybe one) that will be taken forward for further development.

Judgement and Selection

This approach requires skills of selection, evaluation and judgement to whittle down the list to the most useful ideas. In this process, there can be argument and debate about the true potential of ideas. As indicated elsewhere, placing common ideas into themes or patterns of commonality can support this process.

Retaining Creative Seeds

A danger here is that the baby gets thrown out with the bathwater, as good ideas are thrown out with the bad. It is important here to keep a balance, and the divergent thinkers have an important task to challenge the ejection of any ideas that may have serious potential.

Keeping Them Separate

Have you ever been in a thinking session (creative or otherwise) and seen two groups of people crossing swords, where one group are constantly trying to keep the exploration open, whilst the other group is trying to come to a closure point and get a decision made? Maybe you were in one of these two groups.

The Dangers of Simultaneity

Divergent and convergent activities do not go well together, and keeping them deliberately separate is a very good idea as indicated in the above diagrams. Thus, you can explain the principles to people you will then be able to use the language, saying 'excuse me, I hear convergence' if someone starts criticizing ideas in the middle of a divergent session.

Likewise, in convergent sessions, further divergence needs to be carefully managed. It is, however, more important to keep convergence out of divergent activities, as people easily take criticism of one of their ideas personally and may just clam up and sit back if they feel this has happened.

How to Keep Them Separate

Separation can be achieved in several ways. You can separate the sessions by having one after the other (this is most common). You can also separate them further in time (e.g. to give space for more ideas to be generated by incubation first). You can have different groups of people diverging and converging. You can change location for each - for example having the divergent session in a relaxed lounge and the convergent session in a formal meeting room.

Sequencing Them

Divergence and convergence are not a one-shot thing in serious creativity and invention practices such as brain storming. They constantly sequence, one after the other and form a matched pair of activities that enable you to both think broadly and stay focused. As a brain storming process, you may diverge and converge in problem identification, idea exploration, product development, market planning, etc. For example, below the divergent/convergent process is divided into two divergent/convergent processes encompassing four stages: Discover, Define, Design, and Develop. Discover takes advantage of the divergence to collect all problem symptoms and facts, followed by the define the actual problem through the convergent process. Stage two, design, diverges to determine the potential ways to solve the problem, followed by develop, which converges to develop and execute the action plans toward problem resolution.

Suggestions for Getting Deeper Insights

Parnes, in 1981, developed a checklist of questions that could be used during each step to support deeper insights. His suggestions for activities at the various stages:

Mess (Objective) Finding - Use this checklist to prod your thinking deeper into defining what is the problem or challenge. Often used when there is a known problem or symptoms without a defined method to assess what to do.:

Fact Finding - Use Who, What, When, Where, Why and How questions to formulate the facts as can be known now.

Problem Finding - Listing alternative definitions of the problem. One principle of creative problem solving is that the definition of a problem will determine the nature of the solutions. Hence, making sure that the correct problem is being solved will address the challenge. In this step, it helps to begin each statement with "In what ways might we (or I) define ....".

Idea Finding - The divergent-thinking, brainstorming stage. This is where a variety of idea-generation ("creativity") techniques can be use. Ideas are freely proposed without criticism or evaluation, for each of the problem definitions accepted in the second stage.

Solution Finding – While ideas are generated in the brainstorming stage, meaning-making, themes, and pattern development begin to provide insights in the solution finding stage. Insights begin to surface as new awareness begins to develop surrounding the problem. To support the solution finding process, there are three related steps:

  1. Criteria for evaluation must be listed to uncover assumptions and constraints that must be addressed.
  2. The ideas are evaluated in terms of applicability and capability especially in terms of the discovery of insights derived from the meaning-making process, the surfacing of themes and patterns. (An evaluation matrix is useful)
  3. One or more of the best ideas are selected

Criteria might include:

Acceptance Finding - This step focuses on alignment, acceptance and how to get the ideas into action. This may involve creating an action plan, containing specific steps to be taken, by whom, and a timetable for taking them. However, it is also the beginning of future problems if time is not taken to ensure that what is developed in this step involves aligning around and accepting the actions that will be taken.

Multiple Perspectives: Six Thinking Hats

A variant during the six stages is the Six Thinking Hats created by Edward de Bono, and published in his 1985 book of the same name; subsequently revised in newer editions.

The technique forces the team to move outside their habitual thinking style, and to look at things from many different perspectives. This allows them to get a more rounded view of the situation.

The team can often reach a successful solution or outcome from a rational, positive viewpoint, but it can also pay to consider a problem from other angles. For example, the team can look at it from an emotional, intuitive, creative or risk management viewpoint. Not considering these perspectives could lead to underestimate people's resistance to the team’s plans, fail to make creative leaps, or ignore the need for essential contingency plans.

How to Use the Six Thinking Hats Model

Six Thinking Hats can be used in meetings or on your own. In meetings, it has the benefit of preventing any confrontation that may happen when people with different thinking styles discuss a problem, because every perspective is valid especially if used to support a brain storming session. Noteworthy is that six hats can be used in any single or all the stages collectively to get a 360-degree perspective.

Each "Thinking Hat" is a different style of thinking. These are explained below:


The power of the brainstorming process is staying on course with the rules for setting the necessary container for creativity to emerge while using the guidelines to move through the process. Over the years, many brainstorming processes were not as successful due to not maintaining the container resulting in a frenzy of ideas and/or judgements. In addition, following the guidelines for deepening the process supports staying on target. For me, the divergent/convergent process Osborn and Parnes created for problem solving is highly energizing while remaining focused towards the ultimate solution. When used well, complex problems can be solved through an aligned understanding the situation and what needs to be done. When the six stages does not fit well with the tram, shifting to the Six Thinking Hats model can be applied through the diverge/converge method with great success.


1 Japanese anthropologist Kawakita Jiro originally developed the affinity diagram – also known as the K-J Method or the affinity chart – in the 1960s.


Wikipedia https://en.wikipedia.org/wiki/Brainstorming


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