what should all tests passing look like?

I was fixing a fault in cyber-dojo the other day and I happened to be looking at the starting test code for C++. I'd written it using an array of function pointers. At the end of a practice the array might look like this (in main I simply iterate through the array and call each of the functions):

typedef void test();

static test * tests[ ] =
{
    a_recently_used_list_is_initially_empty,
    the_most_recently_added_item_is_always_first,
    items_can_be_looked_up_by_index_which_counts_from_zero,
    items_in_the_list_are_unique,
};

I imagined it written like this instead:

int main()
{
    a_recently_used_list_is_initially_empty();
    the_most_recently_added_item_is_always_first();
    items_can_be_looked_up_by_index_which_counts_from_zero();
    items_in_the_list_are_unique();
}

I wondered why I was putting the function pointers into an array at all. The most obvious thing I lose by not using an array is that I can no longer print out the number of tests that have passed. I thought about that a bit. I started to wonder what benefits I actually get by being told how many tests had run. It's a 100% quantity and 0% quality measurement.

The most obvious benefit I can think of is that, after writing a new test, I can verify it has run by seeing the number of tests increase by one. The problem is I don't think that's a benefit at all. I think that interaction could easily encourage me to not start with a failing test.

If all tests passing produces any output I will look at the output and start to rely on it. That doesn't feel right for a supposedly automated test.

If each passing test introduces any new output, even if it's just a single dot, then I'm in danger of falling into a composition trap. Those dots don't make a difference individually, but sooner or later they will collectively.

If the code I'm testing doesn't produce any output when it runs (which is very likely for unit-tests) then is it right for my tests to introduce any output?

If I want to time how long the tests take to run shouldn't that be part of the script that runs the tests?

I think there is something to be said for all tests passing producing no output at all. None. Red means a test failed and the output should be as helpful as possible in identifiying the failure. No output means green. Green means no output.

Thoughts?

the tao is silent

is an excellent book by Raymond Smullyan (isbn 0-06-067-469-5). As usual I'm going to quote from a few pages:

The Taoist strikes me as one who is not so much in search of something he hasn't, but who is enjoying what he has.

Just what is the Tao; how should one define the Tao? Perhaps one of my favourite definitons is: "the reason things are as they are."

"Don't look for the meaning; look for the use" [Ludwig Wittgenstein]

Is it completely out of the question that there may be objects in the universe which are so sensitive that the very act of naming them throws them out of existence?

It is unnameable because it changes in the very process of naming it.

The situation is perfectly analogous to a man who does not trust his dog and keeps him perpetually chained. The chaining process obviously makes the dog vicious, and the man then says, "You see why such a vicious dog has to be chained!"

You are trying to force that which can thrive only if it is not forced.

Kindness cannot be taught by harshness - not by any amount of harshness.

Freedom is doing what one likes: Zen is liking what one does.

The problem of hiring astrology professors is relatively easy. To hire an astrologer professor, all one has to do is to cast his horoscope and see if he would make a good astrology professor.

My immediate reaction to the remark "one should not be too tolerant" was to be intolerant of it.

Taiichi Ohno's workplace management

is an excellent book by Taiichi Ohno (isbn 978-0-07-180801-9). As usual I'm going to quote from a few pages:

When I was a middle school student in the old system, we studied the Chinese classics, and during this class we learned from the Analects of Confucius. In these writings Confucious says, "The wise will mend their ways" and "The wise man should not hesitate to correct themselves."... Confucius was saying that we should change gracefully... I think his words mean that in the end it is not good if you hold onto your ideas too strongly and try stubbornly to justify them.

When we said we would set up a centralized grinding operation, one experienced worker said, "No, we tried that during the war, but it failed. That's why we do it the way we do now." [I said] "I did not see it fail during the war. Show me again how it fails. If I am persuaded by this, I will let you continue doing it the way you do it now."

If you asked me, "What is the most important part of production control?" I would say it is to limit overproduction.

The kanban was a slip that indicated how many pieces they were coming to get, so that if they were going to take ten parts this became a production instruction slip directing the production line to make ten pieces.

When lot sizes are small, you need to do changeovers more frequently.

Stopping the line causes a great loss, so this forces us to think, "How do we keep them from stopping the line?" and this results in more and more quality kaizen.

You can only really tell what is better based on results.

Accounting cannot do any cost reduction... The shop floor reduces inventory. This money goes to the bank... Instead, accounting thinks it just needs to allocate cost savings targets.

There is something called standard work, but standards should be changing constantly. Instead, if you think of the standard as the best you can do, it's all over. The standard is only a baseline for doing further kaizen. It is kaiaku if things get worse than now, and it is kaizen if things get better than now. Standards are set arbitrarily by humans so how can they not change?

You must create a standard for comparison.

Drop a nut once and pick it up. Working at the average time is like trying to catch the nut halfway because letting it drop all the way down takes too long... There is no such thing as average value in this world.

Do not seek to follow in the footsteps of the old masters, seek instead what these masters sought. [Matsu Basho 1644-1694]

Once he asked me how the terms kaizen and kairyo (reform) were differentiated in the West. I said that while kaizen means to make improvements by using brains, kairyo means to make improvements by using money, and that in the West, most managers only think of improvement in terms of money. [Massaki Imai]

Let the flow manage the processes, and not let management manage the flow.

The aim of kanban is to make troubles come to the surface and link them to kaizen activity. I tell people, "Let idle people play rather than do unnecessary work."

The production line that never stops is either excellent or terrible.

Costs exist to be reduced, not to be calculated.

zen in the art of archery

is an excellent book by Eugen Herrigel (isbn 978-0-14-019074-8). As usual I'm going to quote from a few pages:

He who has a hundred miles to walk should reckon ninety as half the journey.

I have also tried to keep my language as simple as possible. Not only because Zen teaches and advocates the greatest economy of expression, but because I have found that what I cannot say quite simply and without recourse to mystic jargon has not become sufficiently clear and concrete even to myself.

No reasonable person would expect a Zen adept to do more than hint at the experiences which have liberated and changed him, or to attempt to describe the unimaginable and ineffable 'Truth' by which he know lives.

I hit upon the thought that there must be a trick somewhere which the Master for some reason would not divulge, and I staked my ambition on its discovery.

In spite of its being divided into parts the entire process seemed like a living thing wholly contained in itself and not even remotely comparable to a gymnastic exercise, to which bits can be added to taken away without its meaning and character being thereby destroyed.

I once remarked that I was conscientiously making an effort to keep relaxed, he replied: 'That's just the trouble, you make an effort to think about it. Concentrate entirely on your breathing, as if you had nothing else to do.

A great Master, he replied, must also be a great teacher.

You had to suffer shipwreck though your own efforts before you were ready to seize the lifebelt he threw you.

Do you know why you cannot wait for the shot and why you get out of breath before it has come? The right shot at the right moment does not come because you do not let go of yourself. You do not wait for fulfilment, but brace yourself for failure.

Right presence of mind. This means that the mind or spirit is present everywhere, because it is nowhere attached to any particular place.

It is all so simple. You can learn from an ordinary bamboo leaf what ought to happen. It bends lower and lower under the weight of snow. Suddenly the snow slips to the ground without the leaf having stirred. Stay like that at the point of highest tension until the shot falls from you. So, indeed, it is: when the tension is fulfilled, the shot must fall, it must fall from the archer like snow from a bamboo leaf, before he even thinks it.

If I tried to give you a clue at the cost of your own experience, I should be the worst of teachers and deserve to be sacked! So let's stop talking about it and go on practising.

Don't ask, practice!

dojo = way place

Tore Martin Hagen and some of his colleagues did their first team Cyber-Dojo recently. One team member, Manabu Mochida, is from Japan and he wrote a nice explanation of the term Dojo on the white board. Love it. Thanks Manubu.

zen bow, zen arrow

Is an excellent book by John Stevens, isbn 978-1-59030-442-6. As usual I'm going to quote from a few pages:

He never missed a day of teaching, regardless of the weather, and would often sit for hours in the dojo watching and instructing, even if it was freezing outside.

Gratitude will make you brave.

Learn from a teacher everything he or she has, all the way - that is the real secret of training that will give you great results.

Self-reflection encourages great bravery. Rationalization is your greatest enemy.

Fostering the spirit is painful, hard work; shoot each shot as if your life depended on it.

The essence of Buddhism is not meditation or liberation from samsara. It is kenso, "seeing into your nature."

Do your best at each and every thing. That is the key to success. Learn one thing well and you will learn how to understand ten thousand things.

The two greatest virtues: self-control and returning kindness.

Human beings always cling to things. Practice begins when you stop clinging.

One day of effort is one day of bliss; One day of sloth is a hundred years of regret.

The Aesthetics of Change

Is an excellent book by Bradford Keeney. This is its first set of book snippets. Here's the second. As usual I'm going to quote from a few pages...

All simple and complex regulation as well as learning involve feedback. Contexts of learning and change are therefore principally concerned with altering or establishing feedback.

Corrective action is brought about by difference. The system is technically "error activated" in that "the difference between some present state and some 'preferred' state activates the corrective response". Cybernetics therefore suggests that "all change can be understood as the effort to maintain some constancy and all constancy as maintained through change". [Gregory Bateson]

Occidentals ... practice in order to get a skill, which is then a tool - in which I, unchanged, now have a new tool, that's all. The Oriental view is that you practice in order to change yourself.

In the [predator/prey] example, the battle over food and territory between two species is only one half of the story. The larger cybernetic picture is that the battle is a means or process of generating, maintaining, and stabilizing an ecosystem.

For the most part, people take distinctions to be representations of an either/or duality, a polarity, a clash of opposites, or an expression with a logic of negation underlying it.

Both Don Juan and Erickson also made use of introducing confusion to bring about change.

A "dormative principle" is a more abstract repackaging of a description of the item you claim to be explaining. To paraphrase [Gregory] Bateson, this occurs when the cause of a simple action is said to be an abstract word derived from the name for the action... What one does, in this case, is to say that an item of simple action is caused by a class of action. This recycling of a term does not constitute a formal explanation.

When we encounter sufficient complexity, such as recursive organization of human interaction, our inability to discern higher orders of patterns leads us to committing what Whitehead called "the fallacy of misplaced concreteness." We then "abstract from relationship and from the experiences of interaction to create 'objects' and to endow them with 'characteristics'".

The more "fundamental" a premise, the less accessible it will be to consciousness. As Samuel Butler proposed, the more one "knows" something the less aware one becomes of that knowledge.

Mere purposive rationality unaided by such phenomena as art, religion, dream, and the like, is necessarily pathogenic and destructive of life. [Gregory Bateson]

The truth which is important is not a truth of preference, it's a truth of complexity.

Zen and the art of motorcycle maintenance

is an excellent book by Robert Pirsig (isbn 978-0-099-32261-0). As usual I'm going to quote from a few pages:

By far the greatest part of his [the mechanic's] work is careful observation and precise thinking.

Care and Quality are internal and external aspects of the same thing. A person who sees Quality and feels it as he works is a person who cares. A person who cares about what he sees and does is a person who's bound to have some characteristics of Quality.

As Poincaré would have said, there are an infinite number of facts about the motorcycle, and the right ones don't just dance up and introduce themselves. The right facts, the ones we really need, are not only passive, they are damned elusive and we're not going to just sit back and "observe" them. We're going to have to be in there looking for them or we're going to be here a long time. Forever. As Poincaré pointed out, there must be a subliminal choice of what facts we observe. The difference between a good mechanic and a bad one, like the difference between a good mathematician and a bad one, is precisely this ability to select the good facts from the bad ones on the basis of quality. He has to care!

That's really why he got so upset that day when he couldn't get his engine started. It was an intrusion into his reality.

The range of human knowledge today is so great that we're all specialists and the distance between specializations has become so great that anyone who seeks to wander freely among them almost has to forego closeness with the people around him.

This isn't really a small town. People are moving too fast and too independently of one another.

I've a set of instructions at home which open up great realms for the improvement of technical writing. They begin, 'Assembly of Japanese bicycle require great peace of mind.'

Peace of mind isn't at all superficial really, I expound. It's the whole thing. That which produces it is good maintenance; that which disturbs it is poor maintenance. What we call workability of the machine is just an objectification of this peace of mind. The ultimate test's always your own serenity. If you don't have this when you start and maintain it while you're working you're likely to build your personal problems right into the machine itself.

There is an infinity of hypotheses. The more you look the more you see.

It's the sides of the mountain which sustain life, not the top.

It is not the facts but the relation of things that results in the universal harmony that is the sole objective reality.

Always take the old part with you to prevent getting a wrong part.

Impatience is close to boredom but always results from one cause: an underestimation of the amount of time the job will take.

Mu means "no thing". Like "Quality" it points outside the process of dualistic discrimination. Mu simply says, "No class; not one; not zero, not yes, not no." It states that the context of the question is such that a yes or no answer is an error and should not be given. "Unask the question" is what it says. Mu becomes appropriate when the context of the question becomes too small for the truth of the answer.

Apart from bad tools, bad surroundings are a major gumption trap.

Religion isn't invented by man. Men are invented by religion.

When handling precision parts that are stuck or difficult to manipulate, a person with mechanic's feel will avoid damaging the surfaces and work with his tools on the nonprecision surfaces of the same part whenever possible. If he must work on the surfaces themselves, he'll always use softer surfaces to work with them. ... Handle precision parts gently.

Want to know how to paint a perfect painting? It's easy. Make yourself perfect and then just paint naturally. That's the way all experts do it.

The real cycle you're working on is a cycle called yourself.

non violent communcation

is an excellent book by Marshall Rosenberg (isbn 978-1892005038). As usual I'm going to quote from a few pages:

Observing without evaluating is the highest form of human intelligence.

NVC is a process language that discourages static generalizations; instead, evaluations are to be based on observations specific to time and context.

In the sentence, "I feel I didn't get a fair deal," the words I feel could be more accurately replaced with I think.

When the faculties are empty, then the whole being listens.

Intellectual understanding blocks empathy.

I had read research indicating a lack of agreement among psychiatrists and psychologists regarding these terms. The reports concluded that diagnoses of patients in mental hospitals depended more upon the school the psychiatrists had attended than the characteristics of the patients themselves.

When we have a judgemental dialogue going on within, we become alienated from what we are needing and cannot then act to meet those needs. Depression is indicative of a state of alienation from our own needs.

Studies in labor-management negotiations demonstrate that the time required to reach conflict resolution is cut in half when each negotiator agrees, before responding, to accurately repeat what the previous speaker had said.

Don't just do something, stand there.

When we focus on clarifying what is being observed, felt, and needed rather than on diagnosing and judging, we discover the depth of our own compassion.

The Tao of Pooh

is an excellent book by Benjamin Hoff (isbn 1-4052-0426-5). As usual I'm going to quote from a few pages:

Cottleston, Cottleston, Cottleston Pie,
A fly can't bird, but a bird can fly.
Ask me a riddle and I reply:
Cottleston, Cottleston, Cottleston Pie.

It is useless to you only because you want to make it into something else and do not use it in its proper way.

One disease, long life; no disease, short life.

Unlike other forms of life, though, people are easily led away from what's right for them, because people have Brain, and Brain can be fooled. Inner Nature, when relied on, cannot be fooled. But many people do not look at it or listen to it, and consequently do not understand themselves very much. Having little understanding of themselves, they have little respect for themselves, and are therefore easily influenced by others.

For a long time they looked at the river beneath them, saying nothing, and the river said nothing too, for it felt very quiet and peaceful on this summer afternoon. [A.A.Milne]

I think therefore I am Confused.

All work and no play makes Backson a dull boy.

"But you should be something Important," I said.
"I am," said Pooh.
"Oh? Doing what?"
"Listening," he said.

the Bisy Backson Society, which practically worships youthful energy, appearance, and attitudes.

It's really fun to go somewhere where they are no timesaving devices because, when you do, you find that you have lots of time.

We are determined to be starved before we are hungry. [Henry David Thoreau]

From caring comes courage [Tao Te Ching]

...too many who think too much and care too little.

Agile A-Z Keynote

I attended the excellent Agile .NET 2011 conference in Ghent, Belgium this week. Jason Gorman pulled out at the last minute and Erik asked me if I'd step in and do the keynote. I said yes of course and prepared this on the train+plane there.

An Agile A to Z

View more presentations from JonJagger.

Zen in the martial arts

is an excellent book by Joe Hyams (isbn 0-87477-101-3). As usual I'm going to quote from a few pages:

At least empty your cup and try.

Those who are patient in the trivial things in life and control themselves will one day have the same mastery in great and important things.

The martial artist develops through practice until it becomes mechanical and then spontaneous.

When you lose your temper, you lose yourself - on the mat as well as in life.

The proper system is to think twice more. Patience is part of it. To avoid being intimidated - think more and react less.

Try softer. When one eye is fixed upon your destination, there is only one eye left with which to find the way.

To know and to act are one and the same.

Relaxation and concentration go hand in hand. But too much concentration defeats itself.

Most of the time we generate our own fears, and this is especially true when we confront an unfamiliar situation that shatters confidence.

Years ago I thought too much about what I had to do, laboured over it, put off difficult chores, waited for the mood to be right or the creative juices to flow. Now I just do it without conscious effort. It flows because the work and I are one, and not in conflict with each other.

The only reason men fight is because they are insecure; one man needs to prove that he is better or stronger than another. The man who is secure within himself has no need to prove anything with force, so he can walk away from a fight with dignity and pride.

Tao Te Ching

is an excellent book translated by R.L.Wing (isbn 0-7225-3491-4). As usual I'm going to quote from a few pages

In trying to understand a work like the Tao Te Ching, it is important to keep in mind that Chinese characters are not so much representations of words as they are symbols of ideas.

Because of its idea-embedded nature, the Tao Te Ching is a work that brings truth to the adage: It is better to read one book one-hundred times than one-hundred books one time.

True power is the ability to influence and change the world while living a simple, intelligent, and experientially rich existence.

Simplicity in conduct, in beliefs, and in environment brings an individual very close to the truth of reality.

When expectations are dropped, the mind expands, and reality expands along with the mind.

Nothing exists without the presence of its opposite.

Practice non-interference.

A house filled with riches cannot be defended.

Individuals who master themselves become less egocentric

Evolved Individuals strive to be intuitive, spontaneous, and simple.

Never fall completely into step with current society.

Spot the Tao Te Ching Bug

Most mornings I read one of the 81 entries in Tao Te Ching . My copy is called The Tao of Power, translated by R.L.Wing. Highly recommended. I use dice together with the chart in the picture (from page 19) to make a random selection. This morning I happened to notice that I never seem to get certain numbers. Closer inspection of the chart shows why...

The book of five rings

is an excellent book by Miyamoto Musashi, translated by Thomas Cleary (isbn 1-57062-748-7). As usual I'm going to quote from a few pages:

Preface: In common parlance, to do something with a real sword means to do it with utmost earnestness… The Book of Five Rings… explicitly intended to symbolise processes of struggle and mastery in all concerns and walks of life.

The martial way of life practiced by warriors is based on excelling others in anything and everything.

Fourth is the way of the artisan. In terms of the way of the carpenter, this involves skilful construction of all sorts of tools, knowing how to use each tool skilfully, drawing up plans correctly by means of the square and the ruler, making a living by diligent practice of the craft… practice unremittingly.

You should observe reflectively, with overall awareness of the large picture a well as precise attention to small details.

Having attained a principle, one detaches from the principles; thus one has spontaneous independence in the science of martial arts and naturally attains marvels.

As human beings, it is essential for each of us to cultivate and polish our individual path.

Observation and perception are two separate things.

It is essential to be relaxed in body and mind.

If you get to feeling snarled up and are making no progress, you toss your mood away and think in your heart that you are starting everything anew.

In my military science, it is essential that the physical aspect and the mental state both be simple and direct.

Whether in large- or small-scale military science, there is no narrow focus of the vision. As I have already written, by finicky narrowness of focus, you forget about bigger things and get confused, thus letting certain victory escape you.

Things stick in your mind because of being in doubt.

The practice of all the arts is for the purpose of clearing away what is on your mind. In the beginning, you do not know anything, so paradoxically you do not have any questions on your mind. Then, when you get into studies, there is something on your mind and you are obstructed by that. This makes everything difficult to do.

The way of the leader

is an excellent book by Donald Krause (isbn 1-85788-137-0). As usual I'm going to quote from a few pages:

Do the essential things well: Be proactive (do through action), Reduce complexity (concentrate effort on the essential things), Seek improvement (get the essential things done better).

We can never know everything there is to know about a complex process… The knowledge that we really need to optimise a complex process is unknowable. Therefore, we can only approach optimisation a little bit at a time as our understanding grows.

Battles are won by great execution, not by great plans! Great execution can save a mediocre plan; poor execution will always ruin a great plan. [George Patton]

A person who practices self-discipline and continuously develops his level of skill seldom fails in the long term.

Listen carefully. Observe closely.

When the chips are down, the main question is not how you go about meeting your objectives, but whether you succeed in doing so.

For an effective leader, determination is more important than intellect.

Perfection is the enemy of effectiveness.

The art of leadership is an art based on simplicity, and all success is rooted in performance.

Learn by observing the behaviour of other people. If you observe good behaviour, copy it. If you observe bad behaviour, look for the same behaviour in yourself and eliminate it.

There is no surer road to disaster than to fit past solutions, however successful, to current situations.

Discipline is not intended to kill character, enthusiasm, and initiative, but to develop them.

Minimize form and maximise substance.

It is better to be alone than in bad company.

It has been just so in all my inventions. The first step is intuition - and comes with a burst, then difficulties arise... Persistence is the key [Thomas Edison]

Character is a habit. It is created through the daily choice of right and wrong. It is a moral quality which grows gradually to maturity. It does not appear suddenly.

not always so

subtitled Practicing the true spirit of Zen, is an excellent book by Shunryu Suzuki (isbn 0-06-095754-9). As usual I'm going to quote from a few pages:

What is most difficult for any teacher, especially a Zen teacher, is to teach without teaching anything. "If I tell you something," Suzuki Roshi said, "you will stick to it, and limit your own capacity to find out for yourself." But, as Katagiri Roshi said, "You have to say something," because if the teacher says nothing, the students wander about sticking to their habitual ways of being.

Most of the happiness you have is the kind you later regret losing.

You may think it was sudden, but actually it was the result of many years of practice and of failing many times.

Be yourself in the present moment, always yourself, without sticking to an old self.

When you understand how practice goes back and forth, you will enjoy your practice.

A baby has the same basic attitude of interest towards all things. If you watch her, she will always be enjoying her life. We adults mostly are caught by our preconceived ideas.

We attach to the descriptions and think they are reality. That is a mistake.

Usually when we deny something, we want to replace it with something else.

The Buddha's teaching is not about the food itself but about how it is grown, and how to take care of it.

Staying silent will open your intuition… Not to talk does not mean to be deaf and dumb, but to listen to your intuition.

If the left is wisdom, the right is practice.

Rituals are more than just training. Through rituals we communicate and transmit the training in a true sense. We put emphasis on selflessness. When we practice together, we forget our own practice… When you practice your own practice together with others, the true ego-lessness happens.

Everyone has character, but if you don't train yourself, your character is covered by ego.

Practice first, then apply the teaching.

If you want to appreciate good art the most important thing is to see good work.

Practice and enlightenment are one. Practice is something you do consciously, something you do with effort. There! Right there is enlightenment.

Zen mind, beginner's mind

is an excellent book by Shunryu Suzuki (isbn 0-8348-0079-9). As usual I'm going to quote from a few pages:

The most important thing is this moment, not some day in the future. We have to make our effort in this moment. This is the most important thing for our practice.

Usually when you listen to some statement, you hear it as a kind of echo of yourself. You are actually listening to your own opinion. If it agrees with your opinion you may accept it, but if it does not, you will reject it or you may not even really hear it.

Wisdom is not something you learn. Wisdom is something which will come out of your mindfulness.

Right practice, right attitude, right understanding.

The flow of his consciousness is not the fixed repetitive patterns of our usual self-centred consciousness, but rather arises spontaneously and naturally from the actual circumstances that are present.

To give your sheep or cow a large, spacious meadow is the way to control him.

The best way to control people is to encourage them to be mischievous.

The true purpose is to see things as they are, to observe things as they are, and to let everything go as it goes.

Bowing helps to eliminate our self-centred ideas.

Zen is not some kind of excitement, but concentration on our usual everyday routine.

To give is non-attachment, that is, just not to attach to anything is to give.

It is when your practice is greedy that you become discouraged with it. So you should be grateful that you have a sign or warning signal to show you the weak point of your practice.

We should begin with enlightenment and proceed to practice, and then to thinking.

Sclumberger Japan

I visited Japan for the first time recently. I taught an Object Oriented Analysis and Design course for Schlumberger at Machida. The software metier there is a lovely man called Shin'ichi Watanabe who made me feel very welcome. He took me to a proper Japanese restaurant (which seated at most about 8 people) where you had to take your shoes off. The food was delicious as was the saki.

In the brain of Jon Jagger - Deliberate practice

Here's a video (and slides) of my SkillsMatter Deliberate practice talk. This is a much extended version of the 97 Things lightning talk I did at Javazone recently. I've been known to break cameras and mirrors in the past so they wisely filmed it in very low light... :-}