Quick Answer: The Dusthana houses (दुःस्थान) are the 6th, 8th, and 12th - the houses of debt and disease, longevity and transformation, and loss and liberation. They are classically called inauspicious because they describe difficult terrain. But they are also the houses through which a chart accesses depth, endurance, secrecy, and moksha. A planet in a dusthana is not simply afflicted. Read in context, these placements often carry the most concentrated transformative power in a chart.
This guide first treats the 6th, 8th, and 12th houses as a working unit, then considers each one in turn. The aim is not to fear them, but to read them precisely: the 6th rewards sustained effort, the 8th asks for depth, and the 12th becomes workable through surrender. Each demands something different and can give what no comfortable house can.
What Makes a House a Dusthana?
The Sanskrit word Dusthana (दुःस्थान) is built from two parts: dus (दुः), meaning difficult, ill, or hard, and sthana (स्थान), meaning place or station. A dusthana is therefore a "difficult place" in the chart - a house where life does not move smoothly, where ordinary comfort is interrupted, and where the rewards of the ordinary world are harder to access.
The three dusthanas are the 6th, 8th, and 12th houses counted from the Ascendant. Their numbering does not depend on any one chart-drawing style: the 6th stands opposite the 12th, while the 8th remains the hidden transformational house of the triad. In the classical house tradition, these positions correspond respectively to the fields of struggle, transformation, and dissolution.
Traditional Jyotish treats these houses with caution. The Brihat Parashara Hora Shastra is a major compendium of natal Jyotish, although its surviving recensions and chapter counts vary. In the broader classical house tradition, the householder's harder topics are placed here: enemies and illness in the 6th, sudden change and mortality in the 8th, and loss and isolation in the 12th. Both a dusthana lord and a planet placed in a dusthana therefore require contextual reading: will the planet be drawn into the house's difficult significations, or can its nature and strength direct that house toward constructive work?
That is only half the picture. The important nuance is that the dusthanas are not uniformly bad. They are the houses where the chart confronts what cannot be wished away, and that confrontation can also generate concentrated strength. Malefic planets such as Mars, Saturn, Rahu, and Ketu may work constructively in the 6th because the house's labour matches their nature. When the wider chart supports them, Jupiter and Venus in the 12th may deepen spiritual practice because the house concerns dissolution and release. The 8th remains the most feared of the three, yet its intensity can also support research, occult study, surgery, healing, and careful inquiry into longevity.
There is also a structural reason to read the three together. In the usual Purushartha grouping, the 4th, 8th, and 12th form the moksha trikona, while the 2nd, 6th, and 10th form the artha trikona. Each dusthana therefore carries a different emphasis: the 6th works through effort, service, debt, and material responsibility; the 8th through inheritance, crisis, and transformation; and the 12th through release. Together, they describe a chart's relationship to friction, depth, and dissolution.
Each dusthana also has a softer reading, which the rest of this guide will draw out. The 6th is an Upachaya house, so it can improve with effort. As the house of rahasya (secrets) and ayu (longevity), the 8th is mystical as well as fearsome. The 12th is the house of moksha, final liberation from the karmic cycle, and of shayan, the sleep in which the soul touches its source. Reading the dusthanas only as a list of dangers means missing what each one also offers.
The 6th House: Rina, Roga, Ripu (Debt, Disease, Enemy)
The 6th house is the dusthana of effort. Its three principal Sanskrit headings are Rina (ऋण, debt), Roga (रोग, disease), and Ripu (रिपु, enemy). Each names a pressure that calls for a response: debt must be repaid, health restored, and an adversary answered. The 6th therefore gathers situations the chart owner cannot resolve by simply walking away.
These three keywords do not exhaust the house's significations. The 6th also rules service and daily work: the structured routine of employment and duty. It governs litigation, where a dispute moves into the formal channels of law, as well as the maternal uncle, servants and subordinates, pets and small domesticated animals, and the shad-ripu - the six inner foes of desire, anger, greed, delusion, pride, and jealousy. Outer enemies and inner impulses often mirror one another here, so rivalry outside may reveal a corresponding restlessness within.
Why Malefic Planets Often Work Well in the 6th
The single most important interpretive point about the 6th is that malefic planets often perform better here than benefics. This sounds paradoxical at first, because malefics are usually read as troublesome and benefics as protective. The 6th overturns that simple polarity.
The reason lies in the nature of the work. The 6th is not a soft house. Its tasks - confronting illness, fighting rivals, repaying debt, sustaining daily labour, performing service over years - require courage, endurance, and the willingness to keep going when easier options would let the problem grow. Mars (Mangal, मंगल) brings the cutting decisiveness that closes a dispute or treats an infection. Saturn (Shani, शनि) brings the patience to outlast what cannot be defeated in a single move. Rahu (राहु) brings unconventional strategy when ordinary tactics fail. These are exactly the qualities the house needs.
Benefics in the 6th are not bad, but they are differently challenged. Jupiter expands the field he touches, and in a house of debt, illness, or litigation, that expansion can enlarge the problem unless the chart provides discipline elsewhere. Venus prefers harmony, and the 6th is defined by friction. Both can still give protection, ethics, and grace inside conflict, but they tend to civilise the house rather than dominate it. The reading rule is simple: if you see Mars or Saturn in the 6th, do not assume affliction; read for whether the planet is using the house's natural battlefield productively.
The Upachaya Quality: Results Can Mature Over Time
The 6th is also an Upachaya (उपचय) house. The Upachaya group - 3rd, 6th, 10th, and 11th - comprises houses that increase or accumulate. Planets placed in an Upachaya tend to improve their results over time, especially through repeated effort, practice, and discipline. This quality is the 6th's hidden second nature.
In practice, an Upachaya placement may not give its best fruit early in life. The chart owner has to work the house, and a planet in the 6th may show struggle that gradually converts into competence and, with sustained effort, mastery. This pattern can be relevant when reading professions built on service, competition, endurance, or repeated problem-solving, including medicine, law, the military, and athletics. The point is developmental rather than statistical: pressure can become skill over time.
The 6th is therefore one of the chart's most layered houses. Its dusthana nature makes the pressure real, while its Upachaya nature makes that same pressure trainable. These two principles work together: malefics handle the friction, and the Upachaya quality allows repeated effort to compound into strength.
The 6th Lord in Other Houses
The lord of the 6th carries these significations wherever it travels. In the 1st, identity may be shaped by overcoming adversity or by a life organized around service and problem-solving. In the 7th, competitive or conflict-related themes can enter partnership and may have to be resolved through negotiation. In the 10th, career may develop through 6th-house fields such as healthcare, law, the military, or competitive business, while in the 11th, gains may come through service-oriented work and sustained effort.
An especially significant pattern appears when the 6th lord occupies a dusthana, including its own 6th house. Placement in the 6th, 8th, or 12th forms the basic configuration of Harsha Yoga, the 6th-lord branch of Vipareet Raja Yoga. Classical interpretation associates this reversal with the possibility that difficult 6th-house themes become more manageable, but the result is not automatic; planetary strength, associations, the Lagna, and timing still matter. We will return to these conditions later in the article.
The deeper, planet-by-planet analysis of the 6th house - each graha in it, each placement of the 6th lord, transit timing for health and debt, and remedies - is covered in the dedicated 6th house guide. Read it for the full Ripu Bhava workshop.
The 8th House: Ayu, Rahasya, Mrityu (Longevity, Secrets, Transformation)
The 8th house (अष्टम भाव, Ashtam Bhava) is the most feared and the most mystical of the three dusthanas. Its three principal headings - Ayu (आयु, longevity), Rahasya (रहस्य, secrets), and Mrityu (मृत्यु, death) - name the topics where ordinary life touches what it cannot fully see: the length of the life itself, what is hidden beneath the surface, and the final transition out of the body.
The house also encompasses inheritance and in-laws, especially the spouse's family and wealth, along with occult knowledge, research, depth psychology, surgery, sudden events, accidents, scandals, joint resources, and personal crises that transform a life. These topics share one underlying signature: in the 8th, the surface of life cracks open and something previously concealed is revealed.
Why the 8th Is Both the Most Feared and the Most Mystical
The 8th is feared because it gathers topics most people hope to avoid. Sudden change, surgery, accident, scandal, shared liabilities, inheritance complications, and questions of mortality are all read here. Weak planetary dignity, several malefic influences without compensating strength, or a poorly supported 8th lord can contribute to difficult results, but no single factor is sufficient on its own.
It is also mystical because the same depth that brings crisis is the depth that gives the chart access to what most people never touch. The mystic, the surgeon, the researcher, the psychotherapist, the tantric practitioner, the forensic investigator, the actuary - all do their work in the 8th. Each profession requires the same temperament: the willingness to enter what others avoid, the patience to stay there, and the discrimination to bring something useful back out.
This is why an unafflicted 8th, with a competent lord and supportive aspects, can give some of the chart's most distinctive gifts: research ability, occult intuition, longevity itself, and the kind of psychological resilience that grows from having been broken and reassembled. The 8th does not give its rewards easily, but when it does, those rewards tend to be durable and unmistakable.
Scorpio, Mars, and the Natural Association
The 8th house corresponds in the natural zodiac to Scorpio (Vrishchika, वृश्चिक), which is ruled by Mars. This natural association explains a great deal of the house's character. Mars is the planet of weapons, blood, surgery, and the cut that opens what was sealed. Scorpio is the sign of fixed water - deep, brooding, slow-moving, and capable of concentrated intensity that cannot be diverted from its target.
Read Mars and Scorpio together and the pattern becomes clearer. The surgical side of the 8th draws on Mars, while its research side draws on Scorpio's depth. The mystic similarly uses Mars to cut through illusion and Scorpio's water to hold the unconscious. Even the house's crises follow this pattern: they cut open what was hidden, which must then be reabsorbed at depth. The 8th is rarely concerned with the surface.
Ketu has a secondary association with the 8th in many lineages, as the karaka of detachment, ancestral memory, and the moksha-bound side of the dusthanas. A well-placed Ketu in the 8th can give research depth, intuitive understanding of the unseen, and the equanimity that comes from already knowing what others fear.
The Benefits of a Strong 8th House
A strong 8th house is not a contradiction. It is a chart structure most readers recognise too rarely. When the 8th lord is well placed, when supportive planets occupy the house, and when the rest of the chart provides discipline and grounding, the 8th's gifts come forward clearly.
Longevity is one potential reading of a strong 8th because the house signifies ayu, but lifespan must never be judged from this house alone. The same strength may appear as resilience or as the patience to stay with a problem until its hidden structure reveals itself. Occult knowledge belongs here too, because serious astrology, tantra, and depth traditions require a willingness to work beneath the surface. Inheritance, both material and karmic, is another possible 8th-house result when the house is strong and well supported.
Sudden gains - through inheritance, insurance, investment, or unexpected windfall - also belong to the 8th, although they are less reliable than they appear. The 8th gives suddenly, but it also takes suddenly. A reader who finds wealth indications in the 8th should temper enthusiasm with the house's broader volatility.
Vipareet Raja Yoga from the 8th Lord
The 8th lord's most distinctive structural role is in Vipareet Raja Yoga. When it occupies the 6th, 8th, or 12th, classical lineages recognise the basic configuration of Sarala Yoga, the 8th-lord branch of Vipareet Raja Yoga. Sarala means "straightforward" or "easy," and the interpretive logic is reversal: the lord of one difficult house is working within difficult terrain. Whether that reversal produces a rise still depends on the wider chart.
This is not a guarantee. Many interpretive lineages judge the reversal more cleanly when the dusthana lord is not strongly entangled with Kendra or Trikona lords, while a supported Lagna and Lagna lord help the person carry the opportunity created by the yoga. These are strength judgments, not additional placements in the basic definition. We return to them in section five.
The full planet-by-planet analysis of the 8th - each graha in it, longevity calculation, inheritance timing, and remedies - is covered in the dedicated 8th house guide.
The 12th House: Vyaya, Moksha, Shayan (Loss, Liberation, Sleep)
The 12th house (व्यय भाव, Vyaya Bhava) is the dusthana of release. Its three principal headings - Vyaya (व्यय, expenditure or loss), Moksha (मोक्ष, liberation), and Shayan (शयन, sleep) - name the field through which what was held is given up. Sometimes the giving up is loss; sometimes it is offering; sometimes it is dissolution into something larger.
Its full significations cluster around whatever leaves a person's grasp: foreign lands and emigration, isolation and solitude, hospitals and ashrams, sleep and dreams, the unconscious mind, spiritual practice, expenditure, charity, and the soul's final liberation. The 12th also governs secret enemies, distinct from the 6th's visible rivals, as well as hidden sources of support. Both intimate and restful pleasures of the bed belong here, which is why this is the house of shayan (sleep) and shayya sukha (the comfort of the bed).
How Jupiter and Venus Here Can Support Spiritual Practice
The 12th is the dusthana where natural benefics can give especially refined results, and the reason matters. The 12th is the house of dissolution - the place where the soul releases what it accumulated. Jupiter and Venus both know how to soften, sweeten, and let go gracefully, which makes them suited to a house whose work is exactly that.
Jupiter in the 12th, when supported by the rest of the chart, can become a strong spiritual placement. The reading is moksha-oriented: Jupiter, the natural significator of wisdom and dharma, sits in the house of liberation. This placement may support inner peace, generosity, and a relationship with study, teaching, or spiritual practice that grounds the wider life. When well directed, those qualities can be expressed through charitable giving, support for religious institutions, or quiet philanthropy.
Venus in the 12th has its own beauty. Venus is exalted in Pisces, the sign associated with the 12th in the natural-zodiac analogy, and exaltation is Venus's highest sign dignity. This does not mean that every 12th-house Venus is exalted; its actual Rashi determines dignity. When well placed, Venus in the 12th can support pleasure in private life, refined aesthetic sense in solitude, devotional intensity (bhakti), and grace in retreat. The 12th asks Venus to refine pleasure into devotion, and the wider chart shows whether that refinement or simple indulgence prevails.
This does not mean Jupiter and Venus are without risk in the 12th. Both planets can also enlarge expenditure, dissolve material accumulation, and pull the chart toward retreat when engagement was needed. The reading rule is one of context: a 12th-house benefic may support spiritual development when the rest of the chart sustains activity in the world, or reinforce withdrawal when it does not.
The 12th as the House of the Subconscious and Dreams
Modern Vedic readers often connect the 12th with what depth psychology calls the unconscious - the realm of dreams, hidden motivations, ancestral impressions, and the sleeping mind. The classical Sanskrit term shayan (sleep) supports this reading directly. The 12th is the house we enter every night, and what surfaces there shapes the rest of the chart in ways the conscious mind does not see.
A planet in the 12th tends to operate from below the threshold of awareness. The Sun in the 12th can give a private dignity that does not seek public recognition, but also a sense of identity that struggles in bright daylight. The Moon in the 12th may give vivid dreams, deep emotional sensitivity, and tendencies toward retreat or hospitalisation under stress. Mercury in the 12th can produce a mind that thinks best in solitude, in foreign languages, or in dream symbols.
Rahu and Ketu in the 12th deserve special mention. Rahu here often signals foreign settlement, unconventional spiritual hunger, or amplified subconscious turbulence. Ketu in the 12th is often read as a classical signature of moksha-oriented tendencies, spiritual impressions from prior lives, natural detachment, and the kind of equanimity that seems to have arrived before the current biography began.
Foreign Settlement and the 12th House
The 12th is one of the principal indicators considered for foreign lands and emigration in Jyotish. Its symbolism concerns leaving what is familiar, but the 12th alone does not establish permanent settlement. Strong 12th-house activation, especially when linked with the 9th lord, Lagna lord, or 10th lord, may describe emigration, extensive travel, or a career spanning several countries; the rest of the chart distinguishes among these possibilities.
The 12th rules the expenditure of foreign travel, the dissolution of native identity into a new cultural context, and the gains that come from working far from where one was born. A well-placed 12th lord in another auspicious house can produce successful international careers. A 12th lord poorly placed can show emigration that fails to settle, or repeated losses tied to foreign ventures.
Hospital indications also belong here, both the chart owner's own confinement and service to those who are confined. In vocational reading, a meaningful 12th-house connection can direct this symbolism toward medicine, nursing, hospice, or institutional service rather than personal illness. Ashrams, monasteries, and contemplative communities provide a spiritual parallel: both settings suspend ordinary public life for care, retreat, or inward work.
Vipareet Raja Yoga from the 12th Lord (Vimala Yoga)
The 12th-lord branch of Vipareet Raja Yoga is called Vimala Yoga (विमल योग). Its basic configuration arises when the 12th lord occupies the 6th, 8th, or 12th. Vimala means "spotless" or "pure," and classical interpretation associates it with restraint, independence, and the possibility that 12th-house loss is managed more constructively. The wider chart determines whether that potential becomes material accumulation, spiritual discipline, or another form of release.
Again, the yoga is conditional, and we cover its full operation in section five. The 12th-lord-in-dusthana pattern is the third leg of the Vipareet Raja Yoga structure, completing the triangle with the 6th-lord Harsha and 8th-lord Sarala variants.
The full graha-by-graha analysis of the 12th house, including each planet's placement, foreign-settlement timing, and meditation-related remedies, is covered in the dedicated 12th house guide.
Vipareet Raja Yoga: When Dusthanas Give Power
Vipareet Raja Yoga (विपरीत राज योग) is one of the most distinctive structural patterns in classical Jyotish, and it is formed within the dusthana group. The word vipareet means "reverse" or "contrary." When a dusthana lord occupies the 6th, 8th, or 12th, including its own house in the Harsha, Sarala, and Vimala definitions, the difficult significations may be redirected and can support an unexpected rise. This is a potential of the configuration, not an isolated guarantee.
The three classical variants take their names from the lord involved. Harsha Yoga (हर्ष योग, "joy") arises when the 6th lord moves into the 8th or 12th, or remains in its own 6th. When the 8th lord moves into the 6th or 12th, or remains in its own 8th, the result is Sarala Yoga (सरल योग, "straightforward"). The corresponding pattern for the 12th lord - in the 6th, 8th, or its own 12th - is Vimala Yoga (विमल योग, "spotless"). Together, these variants form the complete Vipareet Raja Yoga structure.
Why the Reversal Works
The classical reasoning is that a dusthana lord carries the agenda of its own house wherever it goes. It does not become gentle simply because it changes location. If the 6th lord enters the 10th, for example, 6th-house themes such as service, competition, conflict, or health become connected with career. The result may be demanding or professionally useful depending on dignity, aspects, and the houses that planet also rules.
But if the same lord travels into another dusthana, something different happens. The harmful significations are now spent in difficult terrain. The 6th lord in the 12th is dissolving enemies, debts, and disease into the house of dissolution - a process that classical lineages read as cleansing. The 8th lord in the 6th is bringing transformation into the house of effort - and effort can absorb transformation productively. The 12th lord in the 8th is taking loss into the house of crisis - and crisis can metabolise loss in ways that gradual decay cannot.
So the difficulty is spent in difficult terrain, and what remains is a chart with the dusthana significations partially neutralised. This is the basis of the "Raja Yoga" reading: the chart can rise in an area where it might otherwise have struggled.
Why It Creates Sudden Rise After Struggle
The biographical pattern of Vipareet Raja Yoga is often described as rise after pressure. The chart owner may struggle in early life. The dusthana significations are real, and even the cancellation does not erase the early period of pressure. Enemies appear, illness or debt comes, and loss or crisis interrupts what was planned.
The reversal belongs to the chart's structure, while its results are often most visible during the relevant lord's mahadasha or antardasha and may also be shaped by other timing factors. Such a period need not bring only the expected difficulty: conflict may resolve, debt may become manageable, or an opportunity may emerge from the same domain that had earlier caused pressure. This is the basis of the traditional "rise after struggle" reading, but the form and scale of that rise remain chart-dependent.
How to Identify Vipareet Raja Yoga in a Chart
You can identify the pattern in three steps. First, locate the lords of the 6th, 8th, and 12th houses by sign. Next, check where each lord sits in the chart. Finally, see whether any one of them occupies another dusthana or returns to its own dusthana.
If the 8th lord is in the 12th, the chart contains the basic Sarala Yoga configuration. If the 6th lord is also in the 8th, two Vipareet variants are present. Multiple variants do not by themselves prove a stronger result; each lord's dignity, associations, additional house rulerships, and timing must still be judged. A chart with all three variants contains the full set of Harsha, Sarala, and Vimala configurations, but its outcome remains contextual.
Practical Caveats
Several caveats are important. First, many lineages judge the reversal more cleanly when the dusthana lord is not strongly connected with Kendra or Trikona lords through conjunction, mutual aspect, or exchange. Such contact does not erase the basic placement, but it mixes auspicious and difficult house agendas, so the result can no longer be read as a simple double negation.
Second, the Lagna and Lagna lord must be reasonably strong for the yoga to give its full results. Vipareet Raja Yoga in a weak chart can show difficulty without the corresponding rise. The strength of the Ascendant is the structural support for any Raja Yoga, including the vipareet variants.
Third, timing matters. The yoga's results are often clearest in the relevant lord's dasha or antardasha, but other planetary periods, transits, and chart factors can also trigger or modify the pattern. If the principal period comes late in life or under difficult supporting conditions, the reversal may be delayed or less visible.
Fourth, the yoga does not erase early struggle. It reverses the eventual outcome, not the journey. People with strong Vipareet Raja Yoga frequently describe their lives as having a "before and after" structure - a difficult first phase, and a recognisably different second phase that came after the relevant dasha began.
For complete dusthana-lord-by-placement analysis, including each lord's behaviour in every house, see the house lords placement guide. For the broader context of how dusthanas relate to the rest of the chart's house structure, the 12 houses guide places this material in its full bhava framework.
Frequently Asked Questions
- Should I be worried if I have many planets in dusthana houses?
- Not automatically. Multiple planets in the 6th, 8th, or 12th show that significant life energy is invested in these houses, but the meaning depends on the planets, their dignity, and the rest of the chart. Malefics in the 6th may support endurance and competence in demanding work, while benefics in the 12th may support spiritual development. Vipareet Raja Yoga configurations can indicate the potential for reversal after struggle, subject to the wider chart. Read each placement and its lord before treating dusthana placements as afflictions. The 12 houses guide provides the broader bhava framework.
- Can a dusthana placement give positive results?
- Yes. Malefics in the 6th may work constructively because the house's tasks require courage and endurance. Benefics in the 12th may support spiritual practice, foreign connections, or a refined private life, while well-supported planets in the 8th may support research depth and occult insight. Vipareet Raja Yoga provides the clearest structural example: a dusthana lord in the 6th, 8th, or 12th can indicate the potential for reversal after struggle, but the outcome remains chart-dependent.
- What is the relationship between the 6th and 8th house?
- The 6th and 8th are both dusthanas, but their work differs. The 6th governs visible struggle - enemies, debt, illness, daily work, service. The 8th governs hidden transformation - longevity, secrets, inheritance, sudden change, occult depth. The 6th asks for effort and endurance; the 8th asks for depth and willingness to face crisis. They connect through health (6th for disease, 8th for longevity and surgery), through obligation (6th for debt, 8th for inheritance), and through the Vipareet Raja Yoga formations created when their lords sit in each other's houses. Reading them together gives a fuller picture than reading either alone.
- How do I strengthen a weak dusthana house lord?
- Strengthening a dusthana lord requires care, because direct amplification can intensify its difficult significations. A cautious practical approach is to engage the house's constructive work. For the 6th, that may mean disciplined service, debt accountability, and appropriate health routines. For the 8th, it may mean depth study and responsible handling of inheritance or joint resources. For the 12th, charitable giving, meditation, retreat, or institutional service may express the house constructively where the chart supports them. These practices support reflection and discipline; they do not replace medical, legal, or financial advice.
- Is the 3rd house also a dusthana?
- No, although the question is reasonable because the 3rd carries some difficult themes - younger sibling rivalry, the friction of initiative, the courage required for daily communication. Some lineages call the 3rd a minor or "upachaya dusthana" for this reason. The canonical dusthana group, however, remains the 6th, 8th, and 12th. The 3rd is properly read as an Upachaya house with mildly mixed significations, not as a true dusthana. The Vipareet Raja Yoga structure operates only with the three classical dusthanas. See the trikona-kendra houses guide for the full classification of all twelve bhavas.
Explore with Paramarsh
The dusthana houses describe the chart's relationship to difficulty, depth, and dissolution, but they are not a verdict of suffering. The 6th may reward sustained effort, the 8th asks for depth and a willingness to enter what others avoid, and the 12th teaches graceful release. Read precisely, these houses can reveal research ability, spiritual depth, professional competence in demanding fields, and the potential reversal signified by Vipareet Raja Yoga.
Paramarsh calculates your complete Kundli using Swiss Ephemeris precision: which planets occupy your 6th, 8th, and 12th houses, where each dusthana lord travels across the chart, whether Harsha, Sarala, or Vimala yogas operate, and how the dasha sequence will activate these patterns over time. Read together, these factors show not just where pressure may appear, but how the chart is structured to convert that pressure into strength.