Royal Army College

Lesson Overview

Lesson 01 said preparedness begins with knowing your risks. This lesson does that knowing. It explains why a sensible person prepares for what is likely rather than for everything imaginable, what risk means when the word is used carefully, and how a state assesses its risks in an orderly way. It then turns the idea into a method: a way of thinking about any single hazard, a likelihood-impact grid for sorting hazards into act-now, prepare, and note-only, a plain tour of the common hazards, an account of how authorities keep a risk register, and a single-sheet worksheet for building your own household risk picture. From all of this it draws a Kaharagian risk picture: the handful of hazards a small principality realistically faces. The frame is civil and humanitarian throughout, because the point of knowing the risks is not to brood on disaster but to direct preparation where it will do the most good.

By the end you will be able to explain why preparedness aims at the likely rather than the merely possible, define risk as the combination of likelihood and impact, use a likelihood-impact grid to sort hazards into act-now, prepare, and note-only, describe in plain terms what each common hazard does to a household and what would soften it, explain how a state assesses its risks systematically, sketch a Kaharagian risk picture, and build your own household risk picture to drive the readiness taught in the lessons that follow.

Key Terms

Hazard: something with the potential to cause harm, such as a storm, a flood, a fire, a severe winter, or the failure of a vital service.
Likelihood: how probable it is that a given hazard will occur within some period, from the everyday to the very rare.
Impact: how serious the effects of a hazard would be if it occurred, measured by the harm to people, services, and the life of the community.
Risk: the combination of how likely a hazard is and how serious its effects would be; a rare hazard with grave effects and a common one with mild effects may carry similar risk.
Likelihood-impact grid (risk matrix): a grid that ranks hazards by placing each according to its likelihood along one axis and its impact along the other, so the most pressing risks stand out.
Reasonable worst case: a plausible bad version of a hazard, severe but not fanciful, used as the basis for planning.
Exposure and vulnerability: how much of value lies in a hazard's path, and how easily it would be harmed; a hazard becomes a disaster only where it meets something exposed and vulnerable to it.
Risk register: the orderly written list by which an authority records the hazards it has identified, its judgement of each one's likelihood and impact, and what is being done about it.
Cascading hazard: a hazard that sets off others, as a storm causes a power cut which in cold weather becomes a heating crisis.

Preparing for the likely, not for everything

A person could in principle prepare for anything: meteorite strikes, volcanic eruptions, the collapse of distant empires. To do so would be exhausting and useless, because effort spread across every conceivable calamity is concentrated on none, and most of what is conceivable will never happen. Sensible preparedness is selective. It asks which hazards are genuinely likely, and which would do real harm if they came, and it puts its effort there. This is not complacency. It is the discipline of spending limited time, attention, and money where they will actually protect people.

For a small principality the discipline matters all the more, because resources are modest and cannot be squandered on the improbable. The question Kaharagia must answer is not what could possibly go wrong anywhere, but what is likely to go wrong here, and how badly.

There is a quiet benefit that runs against what people expect: knowing your risks reduces fear rather than increasing it. Vague dread feeds on the unnamed and the unbounded, on the sense that anything might happen and nothing can be done. Name a hazard, weigh it, and match it to a few plain measures, and it stops being a shapeless worry. A national who has thought clearly about the two or three hazards that actually face their home, and taken the modest steps each calls for, carries far less anxiety than one who has refused to think about any of them. The method this lesson teaches is, among other things, a method for being calm.

What risk means

In ordinary speech "risk" is used loosely, but in preparedness it has a precise and useful meaning. Risk is the combination of two things: how likely a hazard is, and how serious its impact would be. Neither alone is enough. A hazard that is very likely but trivial, such as a brief flicker that resets the clocks, carries little risk. A hazard that would be devastating but is almost impossible carries little risk too. Risk lives in the meeting of the two, and the hazards that deserve most attention are those that are both reasonably likely and seriously harmful.

This is why ranking hazards by how frightening they sound misleads. A dramatic but remote danger may matter far less than a dull but probable one. A winter storm that knocks out power to a district for several days is not a frightening idea, yet because it is both likely over the years and genuinely harmful in hard cold, it deserves real preparation. Judging risk well means holding likelihood and impact together and resisting the pull of the merely vivid.

Add a third idea beneath impact: a hazard only does harm where it meets something that can be harmed. This is exposure, how much of value lies in the hazard's path, and vulnerability, how easily that thing would be hurt. The storm that is a disaster for an exposed, ill-prepared household is a manageable inconvenience for a sheltered, ready one. A flood matters where homes sit in low ground and matters little where they do not. Impact is therefore never fixed, which is a hopeful point: a household cannot make a storm less likely, but it can greatly reduce its own vulnerability, and so lower the risk it carries.

How to think about a single hazard

Before sorting many hazards, have a steady way of thinking about one. Faced with any hazard, ask the same five plain questions in order.

First, how likely is it? Judge a serious instance against the record of what has actually happened in places like yours, not against how vivid it feels. Does this come most years, every few years, rarely, or only in a lifetime?

Second, how bad would it be? Picture a reasonable worst case, and weigh the harm across more than one kind: people first, then the services a home relies on, then its stores and money, then the wider community and good order.

Third, what is exposed, and how vulnerable is it? Ask what of value lies in the path: your home, your supplies, the people in your care, and how easily each would be hurt. This is where a national hazard becomes a personal one.

Fourth, what would it drag in behind it? Few hazards arrive alone. A storm brings a power cut; a power cut in winter brings cold; a flood brings dirty water and a health risk. A hazard's true weight includes its train of consequences.

Fifth, and most usefully, what would soften it? Ask what plain measures would reduce its likelihood, its impact, or your own vulnerability. This is the question that turns knowing into doing.

These five questions are the same discipline a national authority applies to a whole country, kept small enough for a single home. Run them on any hazard and in a few minutes you will have a fair sense of where it belongs.

The likelihood-impact grid

There is a simple, widely used tool for holding likelihood and impact together, and the same idea underlies how serious states assess their risks. It is the likelihood-impact grid, sometimes called a risk matrix: likelihood along one axis, from very unlikely to very likely, and impact along the other, from minor to catastrophic. Place each hazard according to its own likelihood and impact, and the picture sorts itself.

The grid is most useful when it tells you what to do. Read it as three bands. Hazards in the upper-right region, likely and harmful, are act now: prepare for these first. Hazards in the broad middle, either likely but mild or rare but grave, are prepare: worth real but proportionate measures, often the same measures that serve the act-now hazards. Hazards in the lower-left region, unlikely and mild, are note only: acknowledge them and spend your effort elsewhere. The bands convert a feeling about a hazard into a decision about your time.

Here is the grid drawn out, with common hazards placed on it. Read impact across the top and likelihood down the side; each hazard sits where its row and column meet.

                         I M P A C T   ( how bad )
                  Minor        Moderate       Severe        Catastrophic
              +-------------+-------------+-------------+-------------+
   Very       |             |   power     |  severe     |             |
   likely     |  brief      |   cut       |  storm /    |             |
              |  flicker    |  (short)    |  high wind  |             |  <- ACT NOW
   L          +-------------+-------------+-------------+-------------+     (upper right)
   I  Likely  |   note      |  loss of    |  flooding   |  long power |
   K          |   only      |  comms      |  of low     |  loss in    |
   E          |             |             |  ground     |  hard cold  |
   L          +-------------+-------------+-------------+-------------+
   I  Un-     |             |  extreme    |  wildfire   |  health     |
   H  likely  |             |  heat       |  in dry     |  emergency  |
   O          |             |             |  season     |  / epidemic |
   O          +-------------+-------------+-------------+-------------+
   D  Very    |             |             |             |  rare       |
      un-     |  NOTE ONLY  |             |             |  large-     |
      likely  |  (lower     |             |             |  scale      |
              |   left)     |             |             |  event      |
              +-------------+-------------+-------------+-------------+

The grid does not pretend to exactness. Placing a hazard takes judgement, and reasonable people may put the same one a square apart; the placements above are illustrative and will differ with where and how you live. Its value is clarity, not precision. It forces likelihood and impact to be weighed separately and then together, makes relative seriousness visible at a glance, and stops a single frightening hazard from crowding out the steady, probable ones. Notice too that the same general readiness, water, warmth, light, food, and a plan, answers almost everything in the act-now and prepare bands at once. That is why the grid points so consistently toward a few plain measures rather than a separate kit for every hazard.

The common hazards and what each one does

With a method in hand, here is a plain tour of the hazards a household is most likely to meet, asking of each: what would this do to my household, and what would soften it? The measures named are only pointers; they are worked out properly in Lesson 03 (household readiness), Lesson 04 (coping without services), and Lesson 06 (evacuation and sheltering).

Severe storms and high winds. Strong winds bring down trees and power lines, strip roofs, and make being outdoors dangerous; the harm is direct damage plus the power lost with the storm, sometimes for days. What softens it: securing or bringing in loose items beforehand, staying indoors and away from windows at the height of it, and holding the readiness, light, warmth, water, food, that carries a home through the power cut a storm so often brings.

Flooding. Water gathers wherever the ground compels it, from rain overwhelming drains to the saturation of low ground. Floodwater is a quiet killer: it moves with deadly force, hides dangers beneath it, and rises faster than people expect. What softens it: knowing whether your home sits in flood-prone ground, never entering or driving through moving floodwater, moving valuables and yourself upward early, and heeding the warning to leave before the water arrives.

Fire, including wildfire. Fire in the home grows more likely in an emergency, when people turn to candles, open flames, and improvised heating. Wildfire runs through dry vegetation in a hot season and moves fast. Both threaten life directly and can take a home in minutes. What softens it: care with all open flame and improvised heat, working smoke alarms, a known way out of every room, keeping flammable growth clear where wildfire is a risk, and leaving early on advice.

Extreme heat and extreme cold. These are hazards in their own right, and they kill quietly, mostly the elderly, the very young, the sick, and the isolated. A hard cold spell threatens anyone who loses heating, and bursts pipes; extreme heat overwhelms the body's cooling, especially indoors and overnight. What softens cold: warmth that does not depend on the grid, layered clothing and bedding, one warm room, and keeping an eye on the vulnerable. What softens heat: shade and ventilation, water and rest, the coolest part of the home in the worst of the day, and again checking on those most at risk.

Power failure. Modern life rests silently on electricity, and its loss takes much with it: heating and cooling, lighting, cooking, refrigeration, phone charging, often water pressure and communications too. A short cut is a nuisance; a long one in hard weather is genuinely dangerous. What softens it: light that does not need the grid, a way to stay warm or cool without it, food that needs no cooking, a charged power source for a phone, and the calm routine of Lesson 04.

Loss of piped water. When the supply stops or becomes unsafe, a household still needs a surprising amount each day for drinking, cooking, washing, and sanitation, and unsafe water spreads illness quickly. What softens it: a modest store of drinking water kept ahead of need, a means of making questionable water safe, and clean handling. The safe storage and treatment of water is taught in depth in the Field Health, Hygiene, and Sanitation course, its proper home.

Loss of communications. Phones, networks, and the internet can fail through damage, overload, or the power cut beneath them, cutting a household off from warnings, from help, and from one another. What softens it: a battery or wind-up radio to receive official warnings when nothing else works, a household agreement on where to meet and how to check on one another if contact is lost, and a charged phone held back for need.

Disruption to food and fuel supply. The food, fuel, medicine, and goods that arrive unremarked every day can be interrupted, and a small principality is stretched hard because it produces little of what it consumes and its stocks are shallow. The harm is rarely sudden starvation but shortage, queues, and rationing. What softens it: a household store of food and essential medicines kept a little ahead of need, so a household can ride out a short interruption without joining the first rush.

A health emergency or epidemic. A serious outbreak, or any event that strains the care of the sick and keeps people apart, is a hazard every nation now takes seriously, and a small one with limited health resources has particular reason to. It may damage not a single building yet keep people home for weeks, overwhelm care, and disrupt supply and work. What softens it: a household able to manage at home for a stretch without going out, basic hygiene and sanitation discipline, a small store of essential medicines, and following official health guidance steadily rather than by rumour.

Civil disruption. Disorder or any breakdown of ordinary calm can make movement unsafe and services unreliable for a time. For a humanitarian home-defence force the posture is firmly civil and protective: the concern is the safety and steadiness of households, not confrontation. What softens it: staying informed through trustworthy channels, avoiding trouble rather than seeking it, keeping the household able to stay in safely for a period, and looking to neighbours and the vulnerable.

These hazards are not separate compartments. They overlap and compound. A severe storm causes a power cut, which in hard winter becomes a heating crisis, which strains the vulnerable, while the same storm blocks the roads that bring in supply. This cascading is why the household measures of the lessons that follow, water, food, warmth, light, and a plan, are general rather than hazard-specific: the lived experience of most emergencies, whatever their cause, is some combination of being cut off, in the dark, cold, and short of what one needs.

How a state assesses its risks

A household can sketch its risk picture from common sense and local knowledge, and should. A state does the same thing more systematically. The method is worth understanding, both because the College's Kaharagian risk picture is built on it and because it is why the official warnings a national receives rest on careful prior assessment rather than alarm. The method, not the content, is what larger states have to teach here: their hazard lists are theirs, but their way of working is sound and adaptable.

At the centre of the method is the risk register: an orderly written record of the hazards an authority has identified, its judgement of each one's likelihood and impact, and what is being done about it. It is kept and revisited rather than written once. The household worksheet later in this lesson is the same instrument kept very small.

The approach runs broadly as follows. Hazards are identified, by gathering knowledge widely: from those who manage the relevant services, from records of what has happened before, and from people with expert understanding. Each is assessed on the two axes already met: likelihood, judged against the historical record and expert estimate, and impact, judged across several kinds of harm, on people, on essential services, on the local economy, on the environment, and on the security and good order of the community. To keep the assessment honest, each hazard is taken in a reasonable worst case rather than a mild or fantastical one. The assessments are then challenged, reviewed by others who can supplement, question, and correct them. The hazards are placed on a likelihood-impact grid so their relative seriousness is visible, and the register is kept current, revisited as events occur and measures are completed.

A second strand, drawn from how some states map natural-hazard risk geographically, adds a reminder: risk is uneven across a territory. A flood map shows where water would actually go; a cold-risk picture shows who would suffer most. So a thorough assessment asks, for each hazard, where and to whom it would do the most harm, paying particular attention to the exposed and the vulnerable.

This is also why the register matters to an individual national, not only to officials. When an authority issues a warning or asks households to be ready, it is acting on exactly this prior assessment; a national who knows that warnings rest on a reasoned register can trust and act on official advice more readily, which is the subject of Lesson 05.

A small principality cannot run elaborate national machinery, and does not need to. Its advantage is that it is small and close-knit: local knowledge is rich, the territory is well understood, and the people who would respond to a crisis know the ground and one another. Kaharagia can build a sound risk picture from exactly these ingredients, and the result is the Kaharagian picture sketched below.

A Kaharagian risk picture

What hazards does Kaharagia, a small principality, realistically face? The picture is drawn in Kaharagian terms and kept deliberately civil and humanitarian. It is not imported wholesale from any larger country's list, because most of what fills the registers of large states, from major industrial accidents to threats peculiar to great powers, has little bearing here. The tour above describes what each hazard does; here they are set in Kaharagian order of priority.

Near the top stand severe weather and storms, both likely and harmful, a single bad one able to disrupt a district for days. Flooding follows wherever water can gather. Severe winter and cold is a hazard in its own right, not merely a feature of storms, bearing hardest on the elderly and the isolated; because cold is where the gravest household danger often lies, its measures are reinforced in person in the Cold-Weather Operations and Survival course, to which this course is closely tied.

Fire belongs on the picture too, both the home fire kindled in an emergency by candles and improvised heating and the wildfire of a dry season. The failure of vital services, power, water, and communications, is among the most consequential hazards of all, because so much else fails with them; the whole of Lesson 04 is devoted to coping when they do. Public-health emergencies every nation now takes seriously, and a small one with limited health resources has particular reason to. And disruptions of supply stretch a small principality hard, because it produces little of what it consumes and its stocks are shallow. As the tour stressed, these hazards overlap and compound rather than arriving singly.

Making your own household risk picture

The national register has a household-sized cousin, and building it is the most useful thing you will do in this lesson, because it makes the readiness in the lessons ahead fit your own home rather than someone else's. It takes a single sheet and perhaps half an hour, and should be glanced at again from time to time as circumstances change. Work through four steps.

Step one, list what is plausible where you live and how you live. Start from the Kaharagian risk picture and the common-hazards tour, then narrow to your situation. Where does your home sit: low ground near water, or high and dry? How exposed is it to wind or to wildfire-prone growth? Who lives there: anyone elderly, very young, unwell, or dependent on power for health? How shallow are your stores, and how far from resupply? Keep the list short and specific to you.

Step two, judge each hazard by likelihood and impact. Run the five questions over each and give it a rough band on both axes, likelihood from very unlikely to very likely and impact from minor to catastrophic, in a plausible worst case. Weigh the dull and probable as seriously as the vivid and rare.

Step three, place each on the grid and read its band. Decide whether each hazard falls in act-now, prepare, or note-only. This turns a list into priorities.

Step four, note what would soften each and what you already have. For every act-now and prepare hazard, write the plain measure that would reduce its impact or your vulnerability and mark honestly whether you have it. The gaps that remain are your readiness list, and they feed directly into Lesson 03.

Here is the worksheet drawn out, ready to copy onto a single sheet.

   HOUSEHOLD RISK PICTURE                       Home: .....................

   Hazard            Likelihood   Impact        Band       What softens it /  Have?
   (plausible here)  (VU..VL)     (minor..cat)  (A/P/N)    your measure       (Y/N)
   ---------------------------------------------------------------------------------
   ................  ..........   ............  .......    ................   .....
   ................  ..........   ............  .......    ................   .....
   ................  ..........   ............  .......    ................   .....
   ................  ..........   ............  .......    ................   .....
   ................  ..........   ............  .......    ................   .....

   Key:  Likelihood  VU very unlikely  U unlikely  L likely  VL very likely
         Impact      minor  moderate  severe  catastrophic
         Band        A act now   P prepare   N note only
   ---------------------------------------------------------------------------------
   Most exposed / vulnerable in this home: ........................................
   First three things to put right: ...............................................

A worked example shows how it comes out. Consider an ordinary household in a generic settled district: a low-lying home near a watercourse, with an elderly relative and the usual shallow stores of a small principality that imports most of what it uses.

   HOUSEHOLD RISK PICTURE                       Home: low ground, near water

   Hazard            Likelihood   Impact        Band   What softens it          Have?
   ---------------------------------------------------------------------------------
   Severe storm      very likely  severe        A      secure loose items;       part
   + power cut                                         light, warmth, food store
   Flooding of       likely       severe        A      know the ground; move up  N
   low ground                                          early; leave on warning
   Winter cold +     likely       catastrophic  A      non-grid warmth; check    N
   long power loss                                     on the elderly relative
   Loss of piped     likely       moderate      P      drinking-water store;     part
   water                                               means to make water safe
   Health emergency  unlikely     severe        P      manage at home a stretch; N
   / epidemic                                          hygiene; medicine store
   Wildfire in       very unlikely moderate     N      clear growth; note only   --
   dry season
   ---------------------------------------------------------------------------------
   Most exposed / vulnerable: the elderly relative if heating fails; the home if
   the watercourse rises.
   First three things to put right: non-grid warmth and a cold-weather plan for
   the relative; a drinking-water store and a way to treat water; a clear early
   plan to move valuables up and, on warning, to leave before the water arrives.

Notice what the worked picture does. It does not treat all hazards equally; it puts the household's modest first effort exactly where this home is both likely to be hit and badly exposed, into warmth for the vulnerable relative, into water, and into a flood plan, and lets the wildfire it will probably never see sit quietly in note-only. The readiness it points to is the substance of Lesson 03; the flood-and-leave plan it calls for is the substance of Lesson 06 (evacuation and sheltering); and the water-treatment and hygiene measures behind it are taught in the Field Health, Hygiene, and Sanitation course. The risk picture is the hinge on which the rest of the course turns from general advice into your plan.

In Practice: A Morning at the Resilience Table

A small working group convenes in the Principality, a handful of people who between them know the place well: someone from the civil services, someone who manages water and power locally, a member of the Army, and one or two long-settled residents. Their task is to sketch the Kaharagian risk picture, and they do it in a single morning. They list what has actually happened over the years: the storms that brought down lines, the winter that froze the pipes, the heavy rain that flooded the low ground by the watercourse, the supply lorry that could not get through for two days. For each they ask the lesson's questions: how likely a serious instance is against the record, how bad a reasonable worst case would be for people, services, and the vulnerable, what it would drag in behind it, and what would soften it. When someone raises a far-fetched danger, the group agrees it is real but so remote that preparing for it would mean neglecting the probable, so it goes in note-only. They place each hazard on the same grid a household would use, and the picture sorts itself: severe weather, winter cold, flooding of the low ground, and the failure of power and water cluster in the act-now corner. They write the morning's work into a simple register, hazard, likelihood, impact, band, and what is being done, so it can be revisited rather than redone, and they note where each would bite hardest, the exposed homes by the water and the elderly on the heating-dependent edge of the district, resolving that preparation and outreach should reach those first. Nothing about the morning is alarming. It is calm, methodical work, the same any household can run at its own kitchen table, and at the end the Principality knows, in plain terms, what it is preparing for and why.

Check Your Understanding

Why does the lesson argue that sensible preparedness is aimed at what is likely rather than at everything possible, and why does this matter especially for a small principality? In your answer, explain how knowing your risks can reduce fear rather than increase it.
Define risk in terms of likelihood and impact, and explain why a frightening-sounding hazard may carry less risk than a dull but probable one. Using the likelihood-impact grid, explain what the act-now, prepare, and note-only bands mean and how exposure and vulnerability decide where a hazard lands for a particular household.
Describe how a state identifies and assesses its risks systematically, including the risk register, the reasonable worst case, the several kinds of impact, expert challenge, and keeping the register current. How does the household worksheet mirror this method, and why does understanding it help a national trust and act on official warnings?

Reflection (write a short paragraph): This lesson asks you to build your own household risk picture by weighing hazards on likelihood and impact rather than by how alarming they sound. Take a single sheet and run the worksheet for your own home and district: list the two or three hazards from the Kaharagian risk picture most likely to affect you, judge each on likelihood and impact in a plausible worst case, place them on the grid into act-now, prepare, or note-only, and note honestly how exposed or vulnerable your household is to each, especially anyone who would suffer most. Then write what that picture suggests about where your preparation should go first, and carry that conclusion forward into Lesson 03.

Summary

Sensible preparedness is selective: it prepares for what is genuinely likely and genuinely harmful, not for everything imaginable, and this matters all the more for a small principality with modest resources. Knowing your risks reduces fear rather than feeding it, because a named and matched hazard is a manageable one.
Risk is the combination of likelihood and impact; neither alone is enough, and a rare grave hazard and a common mild one may carry similar risk. Think about any single hazard by asking how likely it is, how bad it would be, what is exposed and vulnerable, what it would drag in behind it, and what would soften it.
A likelihood-impact grid sorts hazards into act-now (likely and harmful), prepare (the broad middle), and note-only (unlikely and mild), and the same few general measures answer most of them.
A hazard becomes a disaster only where it meets something exposed and vulnerable; impact is therefore never fixed, and a household that lowers its own vulnerability lowers the risk it carries. Because the common hazards cascade, the household measures that follow are general rather than hazard-specific.
A state assesses its risks by keeping a risk register: identifying hazards from wide knowledge, judging each on likelihood and several kinds of impact in a reasonable worst case, challenging the assessments, placing them on a grid, asking where and to whom each would do most harm, and keeping the register current. A household can run the same method on a single-sheet worksheet, and that worked risk picture, not a borrowed list, is what makes the readiness of Lesson 03 (household readiness), the choices of Lesson 06 (evacuation and sheltering), and the health measures of the Field Health, Hygiene, and Sanitation course fit your own home.

Knowing the Risks