PROCESS

Here is How to Build

Design

Rules

The reason comes first

The spine showed that a rule has five dimensions. This discipline takes the fourth, the why, the reason the rule exists. The earlier disciplines met it in passing: that the why explains where the others direct, that a how cannot bend safely without it. Now it is taken on its own, and the first thing to see is that the why is not the last dimension a designer settles. It is the first one they must hold.

You cannot soundly design the other four without it. To choose the deed, the manner, the moment, and the doer well, you must know what the rule is for, because the reason is what tells you whether each of the other four is right. A manner serves a reason; a moment serves a reason; a doer is chosen because the reason needs that doer. Decide the four without the why and you are guessing; the rule may work by luck, but you cannot tell, because you have no measure to judge it against. The why is that measure. So the designer holds the reason from the very beginning, from the highest level, before a single deed is drawn, and designs every other dimension to serve it.

This is why the why is a discipline and not an afterthought. It begins where the design begins, at the coarsest level, when only the broad shape exists, and it is present at every level below, down to the smallest rule. A designer, like a good leader, explains, and you cannot explain what you did not know you were doing. The reason held from the start is what makes the whole design explainable, to yourself first, and then to everyone the rule will meet. Hold the why first, and everything after has something to answer to.

The highest possible standard is to hold the reason from the beginning of the design, at the highest level, and to choose every other dimension to serve it, so the rule is built to a known purpose rather than assembled and justified after the fact.

Key Takeaway: The why is not the last dimension settled but the first one held. You cannot soundly choose the deed, manner, moment, and doer without knowing what the rule is for, because the reason is the measure that tells you whether each of the other four is right. Decide them without it and you are guessing. So the designer holds the why from the beginning, at the highest level, and designs everything to serve it. A designer, like a good leader, explains, and you cannot explain what you did not know you were doing.

The why is not the last dimension you settle; it is the first one you must hold.

MarvinPro · PROCESS · Here is How to Build · Design · Rules · Discipline 5: Why · Section: The reason comes first

MarvinPro | June 2026

marvinpro.com

The why is written, because you will not be there

The other four dimensions show themselves in the doing. You can watch a deed be done, a manner be followed, a moment be hit, a doer act; the work makes them visible. The why is the one dimension that does not show. An observer sees the rule followed and cannot see why it exists; the reason is invisible in the act. So unless it is written, the why is not anywhere. It lives only in the head of whoever held it, and heads forget, and people move on. An unwritten reason is a reason already half lost.

And it must be written for a harder reason than memory. A rule is challenged, and the challenge often does not come to you. People may not ask you to explain. They may say nothing to your face and take their doubt elsewhere, raise it in a room you are not in, carry it upward or sideways to someone else, act against the rule without ever telling you they disagreed. The web of challenge is mostly invisible: you cannot see who is questioning the rule, or where, or when. By the time an objection surfaces, it has often already travelled, and you were not there to answer it.

This is why the reason must be written and must stand on its own. A written why defends the rule when its designer is absent, which is most of the time. It answers the question no one asked you, in the room you never entered, to the person who went around you. The reason on the rule is the rule's own voice; it speaks for the rule across a web you cannot watch. Leave the why in your head and the rule is defenceless the moment the challenge moves out of your sight. Write it down, plainly, and the rule can hold its own ground without you standing on it.

The highest possible standard is to write the reason plainly onto the rule, so that it stands on its own and defends the rule when the designer is absent, across challenges that are raised out of sight and never brought to the designer at all.

Key Takeaway: The other four dimensions show themselves in the doing; the why does not, an observer sees the rule followed but cannot see why, so unless written it lives only in a head, and heads forget. Harder still, challenge often never reaches you: people raise doubts elsewhere, escalate behind your back, act against the rule without telling you. The web of challenge is invisible. So the reason must be written and stand on its own, to defend the rule when its designer is absent, which is most of the time.

A written why is the rule's own voice; it defends the rule in the rooms you never enter.

MarvinPro · PROCESS · Here is How to Build · Design · Rules · Discipline 5: Why · Section: The why is written, because you will not be there

MarvinPro | June 2026

marvinpro.com

The why is argued at every threshold

The reason is not held in silence; it is argued and explained at the moments the work moves forward. Design proceeds by levels, from the broad shape at the highest level down through to the detail, and at each move down to the next level there is a threshold, a point where what was decided is exposed before the work goes further. The why is what is argued at that threshold. Where there is a formal sign-off, the reason is what you give and defend to have the rule approved. The deed, manner, moment, and doer are shown; the why is what justifies them, to the one who must approve.

Where there is no formal sign-off, the same work is done another way, by informing. You tell those who need to know that the work is moving from this level to the next, and that the moment to object is now, before it goes on. This is not informing as a record, telling people so it can be ticked off that they were told. It is informing as a gate: the telling opens the moment to object, and silence lets the work proceed. It brings the invisible web into the open at the right time. The person who would otherwise have carried a doubt away and raised it later is invited, here, to raise it now, while it can still be answered and the design still changed. To inform this way is to defend the why before the objection can travel.

And the defending runs in every direction, because the reason must satisfy everyone the rule meets. Upward, to those who approve and own the larger area, the why answers for cost and risk. Sideward, to Stakeholders and peers, it meets those with their own stake, including the Challenger who brings a real objection worth engaging. Outward, to partners beyond your own structure, whose interests differ, it must hold against a vantage not your own. And downward, to those who must follow the rule, the why gives them the point of it, so they follow with judgement rather than blind obedience. One reason, argued at each threshold, to every direction at once. It is a small thing to say and an enormous thing to do, for the objections are many, they come from all sides, and not all of them are honest or out in the open.

The highest possible standard is to argue and explain the why at every threshold where the work moves forward, through formal sign-off or through informing that opens the moment to object, defending the reason in every direction before the objection can travel out of sight.

Key Takeaway: The why is argued at each threshold where the work moves to the next level. Where there is formal sign-off, the reason is what you defend to get the rule approved. Where there is none, you use the informed way of working: you inform that the work is proceeding and that the moment to object is now, informing as a gate, not as a tick-sheet record, which brings the invisible web into the open while the design can still change. And the defending runs every direction at once: upward to those who approve, sideward to Stakeholders and peers including the Challenger, outward to partners, downward to those who follow.

The why is argued at every threshold, and the informed way of working invites the objection before it can travel behind your back.

MarvinPro · PROCESS · Here is How to Build · Design · Rules · Discipline 5: Why · Section: The why is argued at every threshold

MarvinPro | June 2026

marvinpro.com

A hollow why fails where you cannot see

Not every reason is a real one. A why can be written and still be hollow, and a hollow why is worse than an admitted absence, because it looks like a reason until it is tested. There are a few kinds. The circular reason, which only restates the rule: we do it this way because this is the way it is done. The borrowed reason, which leans on habit: we have always done it so. And the dead reason, which was once true but is no longer: the rule guards against a thing that cannot happen anymore, and no one noticed the danger pass. Each of these answers "why?" with words that carry no purpose, and a rule resting on them is resting on nothing.

A hollow why holds only as long as no one tests it, and on the invisible web it is tested where you cannot defend it. The real reason, written, can answer the challenge raised in your absence; the hollow one cannot, because there is nothing in it to answer with. So the rule falls, and it falls silently, no argument is won against it, it simply has no ground to stand on when someone, somewhere you are not, asks the plain question and finds the reason empty. The rules that quietly collapse are rarely the ones with strong reasons; they are the ones whose reason was a form of words.

So designing the why includes testing it before it is ever challenged. The test is plain: could you give this reason to anyone who asks, in any direction, and have them see the point, the real purpose the rule serves, what would go wrong without it, what it protects? If the reason names a true purpose, it will hold under challenge wherever the challenge comes. If it only restates the rule, or leans on habit, or guards a danger long gone, it will not, and no amount of writing it down will save it. A reason worth writing is one that would survive being read by someone who disagrees.

The highest possible standard is to test the reason before it is challenged, keeping only a why that names a true purpose the rule serves and would survive being questioned by someone who disagrees, rather than a circular, borrowed, or dead reason that holds only until it is tested.

Key Takeaway: A why can be written and still hollow, circular (we do it because it is done), borrowed (we have always done it), or dead (it guards a danger that has passed). A hollow why holds only until tested, and on the invisible web it is tested where you cannot defend it, so the rule falls silently, with no ground to stand on. So test the why before it is challenged: could you give it to anyone, in any direction, and have them see the real purpose? A reason worth writing is one that would survive being read by someone who disagrees.

A hollow why fails silently, where you are not present to defend it; a real one holds wherever it is questioned.

MarvinPro · PROCESS · Here is How to Build · Design · Rules · Discipline 5: Why · Section: A hollow why fails where you cannot see

MarvinPro | June 2026

marvinpro.com

A real example

Follow the same rule into its why. The reason was held from the start: that every customer receive the same clear word, in the same tone, at each step, rather than a different message, or none, from whoever happened to be handling the case. The designer knew this before placing a single message, and chose the template, the three moments, and the doers all to serve it. The why came first, and the rest was built to it.

It was argued where the work moved forward. At the level where the rule was approved, the reason was given and defended, this is what the rule is for, and it justified the fixed wording, the set tone, the placement of each message. Where no formal sign-off stood, the same was done by informing: the team was told the design was moving on, and that the moment to object was then, so that any doubt was raised in the open rather than carried away to surface later. And the reason was written onto the rule, plainly, in a line. That writing did its work months on, when the rule was questioned in a meeting the designer was not in: the reason was already there, answering for the rule, and the rule held a challenge its designer never heard. Later, when a small improvement was made far down in the detail, a changed template for a new kind of case, those who needed to know were told of the new rule and why it existed, so the reason travelled with the change.

Set beside it a hollow why. A message kept in the flow because it had always been sent there, its real purpose long gone, the situation it once served no longer present. No one defended it and no one attacked it; it simply could not answer when someone finally asked what it was for, and it fell without a fight, because there was nothing in its reason to hold it up. The rule with a true reason, written, survived challenges its designer never saw. The rule with a hollow one did not survive the first plain question. That is the whole difference the why makes.

The reason, held first and written plain, is what defends the rule when no one who made it is in the room.

MarvinPro · PROCESS · Here is How to Build · Design · Rules · Discipline 5: Why · A real example

MarvinPro | June 2026

marvinpro.com

Why

The why is the reason the rule exists, and of the five dimensions it is the one that explains rather than directs. It is not the last thing a designer settles but the first thing they must hold: you cannot soundly choose the deed, the manner, the moment, or the doer without knowing what the rule is for, because the reason is the measure that tells you whether each of the others is right. So the why is held from the beginning, at the highest level, and every other dimension is designed to serve it. A designer, like a good leader, explains, and you cannot explain what you did not know you were doing.

Because the why does not show itself in the doing, it must be written, and it must be written for a hard reason: the rule will be challenged when its designer is not there. Objections travel out of sight, raised in rooms you never enter, carried behind your back, acted on without a word to you. A written reason is the rule's own voice, defending it across a web of challenge you cannot watch. And the reason is argued wherever the work moves forward: at a formal sign-off, where it is what you defend to have the rule approved, or through the informed way of working, where you inform that the work proceeds and that the moment to object is now, informing as a gate, not a record, which draws the invisible objection into the open while the design can still change. The defending runs every direction at once, upward to those who approve and own, sideward to Stakeholders and peers and the Challenger who brings a real point, outward to partners whose interests differ, and downward to those who must follow and need the point of the rule to follow it well.

And the reason must be real. A hollow why, circular, borrowed, or guarding a danger long gone, holds only until it is tested, and on the invisible web it is tested where you cannot defend it, so the rule falls silently, with nothing to hold it up. So the why is tested before it is challenged: could it be given to anyone, in any direction, who would then see the true purpose the rule serves? A reason worth writing is one that would survive being read by someone who disagrees. This same why runs the whole life of a rule, from the highest level where it is the substance of sign-off, down to the smallest improvement, where a new rule still carries its reason to everyone who needs to know.

You now hold the dimension that lets a rule be known, owned, defended, and changed. To design the why is to hold the reason from the first, write it plainly onto the rule, argue it at every threshold the work passes through, and keep it real enough to survive a challenge you never see. Do that, and the rule can stand its own ground, explained to whoever asks, in whatever direction, whether or not you are there. The last dimension turns from why the rule exists to whom it falls to: the who.

The why is the rule's reason, held first, written plain, argued in every direction, and real enough to defend the rule when no one who made it is present.

MarvinPro · PROCESS · Here is How to Build · Design · Rules · Discipline 5: Why · Chapter Outcome

MarvinPro | June 2026

marvinpro.com

Think Simple.