Zaki syndrome is a very rare genetic condition that affects development from before birth or early childhood. Early signs of Zaki syndrome can include slow growth, developmental delay, feeding problems, and differences in the face, brain, hearing, or other body parts. Not everyone will have the same experience. Zaki syndrome is lifelong, and it is usually recognized in babies or children, though the exact features can vary from one person to another. Treatment focuses on managing the features of Zaki syndrome with supportive care such as feeding support, physical and speech therapy, hearing or vision care, and surgery or other specialist treatment when needed, and life expectancy depends on how severe the medical problems are.
How many people live with Zaki syndrome?
Global and U.S. prevalence estimates for Zaki syndrome are not consistently reported by a single authoritative source. It appears to be exceptionally rare, with only a small number of cases described in the medical literature, so no reliable estimate is available for how many people are living with it worldwide or in the United States.
Overview
Zaki syndromeSymptoms
Zaki syndrome often causes developmental delay, low muscle tone, and feeding problems. Many people with Zaki syndrome also have distinct facial features, vision or hearing problems, and differences in the brain, heart, hands, or feet.
Outlook and prognosis
Zaki syndrome is lifelong, but outlook varies widely. Many living with Zaki syndrome need ongoing support for development, learning, and sometimes hearing, vision, or organ problems. Early therapies and regular specialist care can improve day-to-day function and comfort.
Causes and risk factors
Zaki syndrome is caused by a genetic change, usually in both copies of the WLS gene. The main risk factor is inheriting one altered copy from each carrier parent; lifestyle or environmental factors are not known causes.
Genetic influences
Genetics are central to Zaki syndrome, because it is caused by harmful changes in a gene. Genetic testing can help confirm Zaki syndrome and show whether both parents carry the same altered gene, which matters for future pregnancy planning.
Diagnosis
Doctors usually suspect Zaki syndrome from clinical features seen at birth or in childhood. The diagnosis of Zaki syndrome is confirmed with genetic tests. Imaging or other exams may help check related differences in the body.
Treatment and drugs
Treatment for Zaki syndrome focuses on each child’s needs and often involves a team for development, feeding, seizures, and breathing. Many living with Zaki syndrome also benefit from physical, occupational, and speech therapy, with regular follow-up as needs change.
Symptoms
Zaki syndrome can affect growth, learning, movement, and several body systems from early life. Some of the early features of Zaki syndrome include delayed milestones, low muscle tone, feeding problems, and slower growth, although not everyone has the same pattern. Features vary from person to person and can change over time. Many living with Zaki syndrome also have recognizable physical differences and may need support from several specialists.
Babies and children with Zaki syndrome often sit, crawl, walk, or talk later than expected. This can make everyday skills take longer to develop and may lead to early therapy support.
Many people with Zaki syndrome have low muscle tone, so they may seem floppy in infancy or tire more easily with movement. This can affect posture, balance, and feeding.
Learning difficulties are common, and speech can be delayed or limited. Some children understand more than they can say and may benefit from speech, school, and communication support.
Feeding can be hard early on, with weak sucking, slow weight gain, or trouble taking enough by mouth. Over time, many children are smaller or shorter than expected for their age.
How people usually first notice Zaki syndrome?
How Zaki syndrome is first noticed often depends on age, but many families first become concerned in infancy because a baby seems very floppy due to low muscle tone, has feeding difficulties, or is slower to reach milestones like holding up the head, sitting, or walking. Doctors may also notice first signs of Zaki syndrome during early checkups, including growth differences and distinctive physical features that can involve the face, hands, feet, or bones, although the exact pattern can vary from child to child. In some cases, it is first recognized after several concerns come together, such as developmental delay along with hearing, vision, or skeletal problems, which then leads to genetic testing to confirm the diagnosis.
Types of Zaki syndrome
No distinct types of Zaki syndrome are widely recognized.
Can I slow down the onset of symptoms?
No, there is no good evidence that lifestyle changes or medicines can meaningfully slow or delay the start of symptoms in Zaki syndrome, because it is a very rare genetic condition and many of its features begin before birth or in early childhood. Care usually focuses on early checkups and support, so problems with feeding, growth, development, movement, hearing, or other body systems can be found and treated promptly; this may improve day-to-day life, but it does not prevent the condition or stop it from starting. Even so, staying closely connected with a care team can still make a real difference in comfort, function, and support over time.
What genetics can tell you about symptoms
For people with Zaki syndrome, genetic testing can confirm the diagnosis and may give some clues about how the condition is likely to show up, including whether developmental differences and physical features are more or less severe. Different harmful changes in the related gene can be linked with differences in which features appear and how early they begin, often starting before birth or in early infancy, but the match is not exact. In other words, genetics helps outline the general pattern, yet it usually cannot predict every symptom or how strongly one person will be affected.
Causes and risk factors
The main cause of Zaki syndrome is a harmful change in a gene called WLS. In most families, this change is inherited, and the chance of having an affected child is higher when both parents carry the same change. Family history and parents who are related by blood can raise that risk. Lifestyle or environmental factors are not known to cause Zaki syndrome, but general pregnancy health can still affect overall wellbeing. If Zaki syndrome runs in your family, genetic testing can sometimes clarify your personal risk and the risk of having a child with Zaki syndrome.
What are the most common causes or risk factors?
Zaki syndrome is caused by a rare change in a gene called WLS, which affects how the body develops before birth. It most often happens when a child inherits one changed copy of this gene from each parent, so the main risk factors are a family history of the condition, having two parents who carry the same rare gene change, and parents who are related by blood, which makes that more likely. There are no known lifestyle, diet, or environmental causes.
Environmental and biological risk factors
If you are looking for environmental or biological risk factors for Zaki syndrome, the honest answer is that none have been clearly proven so far. This condition is very rare, so researchers have limited data to connect it to a consistent pattern of body-based or environmental influences. Researchers are still exploring how outside influences interact with our inner biology, but no such factors are well established for this condition.
No specific exposure during pregnancy, such as pollution, radiation, infection, or chemical contact, has been consistently linked to this condition in published reports. Current evidence does not support a clear environmental trigger.
Doctors have not identified a consistent link between Zaki syndrome and maternal age, diabetes, high blood pressure, or other common pregnancy-related health conditions. Because so few cases have been studied, this could change as more research becomes available.
Prematurity, delivery complications, and illness around the time of birth have not been shown to increase the chance that this condition occurs. When these issues are present, they are usually treated as separate medical concerns rather than known causes.
Strong risk-factor studies are hard to do because this syndrome is so rare. As a result, families often do not get a clear body-based or environmental explanation, even after careful medical review.
Genetic risk factors
When people look into the genetic causes of Zaki syndrome, the main explanation is harmful changes in the WLS gene. The condition is usually inherited in an autosomal recessive pattern, so a child must inherit a nonworking copy from both parents. Some risk factors are inherited through our genes. In practice, the main genetic risks are having two carrier parents, a family history of the condition, or parents who are biologically related.
WLS gene: Zaki syndrome is linked to harmful changes in the WLS gene. This gene helps control signaling that guides growth and development before birth.
Recessive inheritance: Zaki syndrome usually follows an autosomal recessive pattern. This means a child is affected only when both copies of the gene are not working properly, with one altered copy inherited from each parent.
Carrier parents: Parents who each carry one altered WLS copy usually do not have symptoms themselves. For each pregnancy, there is a 25% chance of having a child with Zaki syndrome, a 50% chance of having a carrier child, and a 25% chance of having a child without the altered gene.
Family history: A family history of Zaki syndrome or a known WLS change can raise the chance that other relatives are carriers. This may be important for relatives who are planning a pregnancy and want clearer information about their risk.
Related parents: When parents are biologically related, they are more likely to carry the same rare gene change passed down through the family. That can increase the chance of autosomal recessive conditions such as Zaki syndrome in their children.
Lifestyle risk factors
Zaki syndrome is a rare genetic condition, so lifestyle habits do not cause it. Still, how lifestyle affects Zaki syndrome can matter for day-to-day function, symptom control, and the chance of secondary complications. The most relevant lifestyle risk factors for Zaki syndrome are usually the ones that influence mobility, nutrition, sleep, breathing, and access to supportive therapies. Because features vary widely, the impact of each factor depends on the person's specific medical and developmental needs.
Low daily movement can worsen muscle weakness, joint stiffness, poor endurance, and loss of function in people with Zaki syndrome. Regular, tailored physical activity or physiotherapy may help maintain mobility, balance, and participation in daily tasks.
Inadequate calorie, protein, vitamin, or mineral intake can make growth problems, low muscle mass, fatigue, and delayed recovery more pronounced. If feeding is difficult, structured nutrition support can reduce one of the key lifestyle risk factors for Zaki syndrome.
Irregular sleep, short sleep, or untreated sleep-related breathing problems can worsen daytime fatigue, behavior, learning, and overall functioning. Good sleep routines and evaluation for snoring or apnea may improve symptom management.
Excess weight can add strain to weak muscles and joints, reduce mobility, and make physical therapy harder to tolerate. It may also increase the risk of breathing and sleep complications in some affected individuals.
Risk prevention
Zaki syndrome is a rare genetic condition present from birth, so there is no proven way to prevent the syndrome itself after conception. For families with a known history, genetic counseling may help clarify recurrence risk before or during pregnancy. For people living with Zaki syndrome, prevention usually means lowering the chance of complications through regular monitoring, supportive care, and early treatment when new problems appear. Different people need different prevention strategies—there’s no single formula.
If Zaki syndrome has affected a child or runs in the family, genetic counseling can help estimate the chance of it happening again. This may support informed decisions about testing before or during pregnancy.
Ongoing care with a pediatrician or genetics team can help catch problems early, since Zaki syndrome can affect more than one body system. This is often the best way to reduce the impact of early symptoms of Zaki syndrome and later complications.
Some children with Zaki syndrome may have feeding difficulties, slow growth, or trouble gaining weight. Early support from feeding specialists and dietitians can help protect nutrition, strength, and day-to-day comfort.
Hearing and eyesight checks are important because unrecognized problems can make communication and learning harder. Finding these issues early may allow hearing aids, glasses, or other supports to start sooner.
Can you prevent Zaki syndrome?
No, Zaki syndrome cannot usually be prevented because it is caused by a change in a gene that happens before birth, not by anything a parent did or did not do. Diet, lifestyle, and routine medical care are not known to stop it from happening. If Zaki syndrome has affected your family, genetic counseling may help you understand the chance of it happening again in a future pregnancy.
Transmission
Zaki syndrome is a rare genetic condition, so it is not infectious and cannot be passed from one person to another through coughing, kissing, sex, shared food, or everyday contact. For many families, this means there is no risk of catching Zaki syndrome at home, school, or work.
Instead, how Zaki syndrome is inherited relates to the gene changes a child receives before birth. Based on the cases described so far, Zaki syndrome appears to follow an autosomal recessive pattern, which means a child usually inherits one nonworking copy of the gene from each parent, while parents who carry one copy often do not have symptoms.
When to test your genes
For Zaki syndrome, genetic testing is usually considered when a child has developmental delay together with multiple birth differences, or when there has been a previous affected pregnancy. Testing is mainly used to confirm the diagnosis, guide screening for related medical issues, and support family planning.
Diagnosis
Zaki syndrome is usually suspected when a child has a pattern of developmental, physical, and sometimes organ-related findings that seem to fit together rather than pointing to one isolated problem. Doctors usually begin with a careful review of growth, development, and visible features, then use targeted testing to confirm the cause. Because this is a rare genetic condition, the diagnosis of Zaki syndrome often becomes clearer when clinical findings and genetic results are considered side by side.
Doctors look at the overall pattern of findings, such as developmental delay, differences in muscle tone, feeding or growth concerns, and distinctive physical features. No single sign proves Zaki syndrome on its own, but the combination can raise strong suspicion.
A detailed family and health history can help show when symptoms began and whether similar features have appeared in relatives. This also helps doctors decide whether other genetic or non-genetic conditions need to be considered.
The genetic diagnosis of Zaki syndrome is usually confirmed with genetic tests that look for a disease-causing change in the responsible gene. Testing may be done as a single-gene test or as part of a broader panel or exome test when the diagnosis is not obvious at first.
A full exam helps identify features that may not be obvious in day-to-day life, including growth patterns, head size, joint findings, and neurologic differences. These findings help guide which genetic tests are most useful.
How is Zaki syndrome diagnosed?
Doctors usually suspect Zaki syndrome by looking at the full pattern of signs over time, including a child’s growth, development, and physical features, along with the medical history and exam. Depending on what is found, they may also use tests such as brain imaging, heart checks, or other specialist exams to look for problems that can occur with the condition. Genetic testing is often used to confirm the diagnosis by finding the gene change linked to Zaki syndrome.
Stages of Zaki syndrome
Zaki syndrome does not have defined progression stages. This is because it is a rare genetic condition that is usually described by a pattern of lifelong developmental and physical features, rather than a step-by-step worsening over time. Doctors usually start with a conversation about development, medical history, and day-to-day concerns, then combine that with a physical exam and tests such as genetic testing to confirm the diagnosis. Sometimes answers come quickly, while other times it takes longer, and follow-up usually focuses on tracking growth, learning, movement, and other features that can change with age rather than looking for early symptoms of Zaki syndrome in set stages.
Outlook and prognosis
The outlook for people with Zaki syndrome is variable and depends largely on the severity of brain, eye, skeletal, and other congenital abnormalities present in each individual. Because it is an extremely rare condition with only a small number of reported patients, the long-term prognosis for Zaki syndrome is not well defined, and there are no large studies that establish a typical life expectancy. Most affected individuals are expected to have ongoing developmental, intellectual, and physical support needs, and some may have significant medical complications requiring multidisciplinary care. Prognosis is generally less favorable when there are major structural brain differences, severe feeding or respiratory problems, or other serious organ involvement. Mortality data are very limited, but early death may occur in the most severely affected cases, while milder presentations may be compatible with longer survival. Early supportive treatment, rehabilitation, and careful monitoring can improve quality of life even though the underlying genetic condition cannot currently be cured.
Long-term effects
For many living with Zaki syndrome, the long-term picture usually centers on development, learning, growth, and body systems that may be affected from childhood onward. Long-term effects vary widely, and some people have milder day-to-day challenges while others need ongoing medical and developmental support. As children grow into adolescence and adulthood, the main long-term features often stay present, though their impact can change with age.
Many people with Zaki syndrome have lasting developmental delay and intellectual disability that affect speech, learning, and daily independence. Early features often continue into adult life, although the degree of support needed can vary a lot from one person to another.
Slow growth, trouble gaining weight, and short stature can remain important long-term features of Zaki syndrome. In some children, feeding difficulties are more noticeable early on, while later the main issue may be staying on a steady growth curve.
Some people with Zaki syndrome have long-term differences in the bones, joints, hands, feet, or spine that can affect posture and mobility. For many, this can mean tiring more easily with walking, needing help with fine motor tasks, or having ongoing orthopedic follow-up.
Hearing loss and eye problems can have lasting effects on communication, learning, and safety. You might notice this in everyday life when a child struggles to follow conversation in a noisy classroom or has trouble tracking objects clearly.
How is it to live with Zaki syndrome?
Living with Zaki syndrome can look very different from one person to another, but for many it means growing up with developmental differences and, in some cases, medical issues that need ongoing care from several specialists. Day to day, this can affect feeding, communication, learning, movement, and energy, so many living with Zaki syndrome benefit from therapies, school supports, and routines adapted to their pace and strengths. It also shapes the lives of parents, siblings, and other caregivers, who often spend a great deal of time coordinating appointments and support, but with the right help, many families build a steady rhythm that makes daily life more manageable and meaningful.
Treatment and drugs
Treatment for Zaki syndrome focuses on the problems each child or adult is having, because there is no single cure that fixes the underlying genetic change. Many living with Zaki syndrome need care from several specialists, with therapies such as physical, occupational, and speech therapy, plus medicines or procedures for issues like seizures, feeding difficulties, vision or hearing problems, or heart and kidney concerns if these are present. Not every treatment works the same way for every person, so care is usually adjusted over time as symptoms change and new needs appear. Supportive care can make a real difference in how you feel day to day, and regular follow-up helps families and doctors choose the safest, most helpful mix of treatments.
Can you cure Zaki syndrome?
No, there is no cure for Zaki syndrome at this time. Because it is a rare genetic condition, care focuses on managing symptoms, supporting development, and watching for problems in the parts of the body it affects. Treatment cannot remove the condition, but it can often improve comfort, daily function, and quality of life.
Non-drug treatment
Day-to-day care for people living with Zaki syndrome usually centers on building skills, easing symptoms, and helping with feeding, movement, communication, and learning. Because Zaki syndrome can affect several body systems, care is often tailored to each child or adult rather than following one set plan. Supportive therapies can make daily tasks easier and help families work toward practical goals at home, school, and in the community.
Early therapy services can support development during infancy and the preschool years, especially when delays affect sitting, walking, play, or communication. For many, early intervention for Zaki syndrome includes a mix of developmental therapy, family coaching, and regular goal-setting.
Physical therapy can help with balance, muscle weakness, joint tightness, and motor delays that may make stairs, playground time, or long walks harder. Many living with Zaki syndrome use it to improve posture, mobility, and day-to-day independence.
Occupational therapy focuses on everyday skills such as dressing, feeding, handwriting, and using the hands more easily. It may also suggest helpful tools or home and school changes when fine motor tasks feel tiring or frustrating.
Speech and language therapy can support talking, understanding language, and social communication. If speech is very limited, therapists may introduce other ways to communicate, such as picture systems or communication devices.
Your genes may have an impact on how drugs work for you
Because Zaki syndrome is caused by a change in a gene, it is natural to wonder whether that also changes how medicines work. Right now, there is no well-established evidence that Zaki syndrome itself causes a specific, predictable response to the medicines often used in care, so doctors usually pick and adjust treatment based on the person’s symptoms, age, and any heart, brain, or other body problems, while watching closely for side effects. Some people may also have other inherited differences that affect how their body handles certain medicines, but this is not considered a main or routine part of Zaki syndrome treatment.
Pharmacological treatments
There is no single medicine that treats the underlying genetic change in Zaki syndrome, so treatment is usually tailored to the problems someone is having day to day. Drug treatments are not about fixing everything at once, but they can help manage symptoms such as seizures, reflux, constipation, sleep trouble, muscle stiffness, or behavior that is getting in the way of comfort and daily life. Because Zaki syndrome can affect people differently, the medications used in Zaki syndrome may vary a lot from one person to another. Most children and adults living with Zaki syndrome need regular follow-up so medicines can be adjusted as needs change.
If someone with Zaki syndrome has epilepsy, doctors often use standard anti-seizure medicines such as levetiracetam, valproic acid, clobazam, or lamotrigine. The choice depends on seizure type, age, and side effects, since there is no one best seizure drug for everyone.
Medicines such as omeprazole, lansoprazole, or famotidine may be used when acid reflux causes pain, feeding trouble, arching, or poor sleep. This can be an important part of treatment for Zaki syndrome when stomach contents repeatedly come back up into the food pipe.
Polyethylene glycol, lactulose, or senna may help if constipation is causing belly pain, straining, or reduced appetite. For many living with Zaki syndrome, easing constipation can make feeding, sleep, and comfort better.
Melatonin is commonly used when falling asleep or staying asleep is hard, especially if nights are very broken. Some may also need other sleep medicines, but these are chosen carefully because daytime sleepiness can be a problem.
Genetic influences
In Zaki syndrome, the genetic link is clear: it is caused by harmful changes in the WLS gene. This gene helps important signals move between cells during early development, so when both copies are not working properly, growth and development can be affected in several parts of the body. Zaki syndrome is usually inherited in an autosomal recessive pattern, meaning a child receives one changed copy of the gene from each parent. A carrier means you hold the gene change but may not show symptoms. Knowing the genetic cause of Zaki syndrome can help families understand why it happened and the chance of it happening again in a future pregnancy. It can also guide testing for relatives and support discussions with a genetics specialist about how Zaki syndrome is inherited.
Is Zaki syndrome genetic?
Genetics are central to Zaki syndrome, because it is caused by harmful changes in a gene. Genetic testing can help confirm Zaki syndrome and show whether both parents carry the same altered gene, which matters for future pregnancy planning.
Having a genetic risk is not necessarily a diagnosis
Changes in genes are a normal and common part of being human. Most of these variants do not directly affect health and simply reflect natural differences among people. For many genes, having a variant connected with a condition suggests a possible link rather than a certain diagnosis, especially when several genes and environmental factors are involved. In some situations, though, one well-understood variant in a particular gene can be enough to confirm a diagnosis.
Pharmacogenetics—how genetics influence drug effects
In Zaki syndrome, the gene change mainly helps doctors understand why certain health and developmental problems happen, and that shapes care more than it points to one specific medicine. For many living with Zaki syndrome, treatment is usually symptom-based and may include therapies, feeding support, and medicines only when there is a related problem to treat, such as seizures, reflux, or sleep issues if those are present. The genetic result can still be very useful because it helps confirm the diagnosis, look for other concerns that sometimes go along with Zaki syndrome, and avoid a long stretch of trial-and-error testing. Genetics is only one factor, so the medications used to treat Zaki syndrome are usually chosen based on your child’s actual symptoms, age, other medical conditions, and how they respond over time. In other words, when families ask how genetics affect treatment for Zaki syndrome, the answer is usually that genetics guides the overall care plan, while day-to-day drug choices are tailored to the individual.
Interactions with other conditions
For many living with Zaki syndrome, the main issue is usually not that it directly causes other diseases, but that it can come with several health problems at the same time that affect everyday care. Doctors call it a comorbidity when two conditions occur together. In Zaki syndrome, these can include developmental delay, feeding difficulties, hearing or vision problems, seizures in some children, and sometimes differences affecting the heart, kidneys, or genitals, depending on the person. A child with Zaki syndrome who also has swallowing or breathing problems, for example, may get chest infections more easily and may need closer watching during illness or surgery. Because Zaki syndrome is very rare, there is no clear evidence that it has a specific link with common adult illnesses such as diabetes or high blood pressure, but having several medical needs at once can make treatment more complex. Coordinated care can help make sure one problem, medicine, or procedure does not accidentally make another issue harder to manage.
How genes can cause diseases
Humans have more than 20,000 genes, each carrying out one or a few specific functions in the body. One gene instructs the body to digest lactose from milk, another tells the body how to build strong bones and another prevents the body's cells from beginning to multiply uncontrollably and developing into cancer. As all of these genes combined are the building instructions for our body, a defect in one of these genes can have severe health consequences.
Through decades of genetic research, we know the genetic code of any healthy/functional human gene. We have also identified that in certain positions on a gene, some individuals may have a different genetic letter from the one you have. We call these hotspots "Genetic Variations" or "Variants" in short. In many cases, studies have been able to show that having the genetic letter "G" in the position makes you healthy, but having the letter "A" in the same position disrupts the gene function and causes a disease. Genopedia allows you to view these variants in genes and summarizes all that we know from scientific research, which genetic letters (Genotype) have good or bad consequences on your health or on your traits.
What other conditions can cause similar symptoms to Zaki syndrome?
Because Zaki syndrome is very rare and can affect growth, learning, hearing, and the shape of the face, hands, feet, and internal organs, doctors may also consider other genetic conditions such as Robinow syndrome, Kabuki syndrome, CHARGE syndrome, and Townes-Brocks syndrome. These can share some of the same day-to-day problems, so a careful exam and genetic testing are usually needed to tell them apart.
History
For many families, the story of Zaki syndrome begins not in old textbooks but in a long search for answers. A child may have developmental differences, feeding problems, low muscle tone, or unusual findings on scans and exams, yet no one diagnosis seems to tie everything together at first. That kind of uncertainty has shaped the early history of Zaki syndrome.
Unlike conditions described centuries ago, Zaki syndrome is a newly recognized disorder in modern medicine. Once considered rare, now recognized as a distinct condition, it was identified after doctors and researchers noticed that a small number of children shared a similar pattern of health and developmental features. Improvements in genetic testing helped connect these cases, showing that what had looked like unrelated symptoms could belong to the same syndrome.
Because it is so rare, the medical history of Zaki syndrome is still fairly short. Early reports focused on carefully describing what doctors could see: growth and developmental differences, changes involving the brain and other organs, and the day-to-day challenges many living with Zaki syndrome may face. In practice, this meant that some families finally had a name for concerns that had been present since infancy or early childhood.
As medical science evolved, researchers were able to look beyond symptoms alone and identify a genetic cause, which helped confirm that Zaki syndrome was its own condition rather than a variation of another developmental disorder. This has mattered for both care and counseling. It has also helped doctors better recognize the early symptoms of Zaki syndrome, although the exact features and severity can still vary from one child to another.
The history of Zaki syndrome is still being written. As more people are diagnosed and followed over time, doctors are learning more about what to expect, which health issues need closer monitoring, and how to support development and quality of life. For families, that growing knowledge can make a real difference, turning a very new and unfamiliar diagnosis into one that is better understood and easier to plan for.