Taiichi Ohno was fond of saying "use the way of the ninja, not of mathematical calculations". He had fun with language even as he left the people he scolded puzzled by his words. Perhaps in today's language he might say "when doing kaizen be a ninja, not an accountant" or perhaps even "get it done by hook or by crook, don't fret about cost absorption!" What did he mean by ninjutsu - the art of the ninja? I am not sure that even his students really understood him, since whenever questioned, these sensei gave me the "think about it for yourself!" rejoinder.

Ninjas were the superheros of my youth, and oddly, also of the youth of the Western world today thanks to Japanese cartoons. We pored over books to teach ourselves the ways of the ninja. We would hide, throw wooden darts, and fight with our opposing ninja faction at every opportunity. Whatever the attraction of these medieval Japanese spies, assassins and saboteurs, it seems to cross generations and cultures.

Thinking back on the mythology of the ninja, there are several points that strike me as examples of the kaizen mindset. The young ninja was taught to leap tall buildings by first jumping over a sprouting seedling. Easy, sign me up for ninja school, you might say. Well, each day this seedling grew taller until one day the ninja master required that you leapt over the giant spruce. Impossible? Not according to ninja lore, and very much in line with the idea of daily continuous improvement resulting in huge performance improvements over time.

The ninja was crafty, because unlike the shogun who could muster swords, samurai and spear-toting conscripts, he had to use limited resources. The ninja did his or her work with what he could carry on his person. Often this was very little. He was agile, quick and quiet. He did not face the military machine head-on but snuck in through the cracks in their defenses to spy, disrupt or worse.

One favorite activity as kids was to build wooden swords sturdy enough to let us not only fight with them but also use them as a stepping tool for leaping over fences. The ninja was often depicted placing his sword against a wall, stepping on the oval-shaped guard on the hilt of the sword, and making his escape over the wall. You weren't real ninja material unless you could run, place your sword, step and leap over a fence while pulling your sword up after you with the attached cord. A samurai would never dishonor the spirit of his ancestors by stepping on his sword - allowing the ninja his escape. As in kaizen, you think outside the box and get the job done with the tools at hand.

Sometimes what your lean transformation effort needs is stealth, not overwhelming promotion and popular support from leadership and the rest of the management bureaucracy. Existing power structures and cultures do not like to be changed, and the ninja knows this. The ninja does not fight the battle directly, but rather wages a war of stealth, an information war. In practical business terms this may mean building success cases in smaller ways before implementing across the board, or spending time finding out those who will not support kaizen in your organization, and dealing with them. The work of the successful ninja will be noticed only when it is too late for the opponent to make a defense. Sometimes you may need to "ninja" your kaizen efforts.