Monotropism
The idea that autistic attention gathers into a few strong interests at a time. Where it came from, why many autistic people recognize themselves in it, how little of it has been tested, and the arguments over what it explains.
The idea that autistic attention goes into a few strong interests at a time. Where the idea came from, why many autistic people like it, and how little scientists have tested it so far.
What people mean Community
In community writing, monotropism means that a person's attention gathers into a few interests at a time, each pulling hard, with little left over for anything else. Fergus Murray, an autistic science teacher whose mother, Dinah Murray, first proposed the idea, puts it in one line: "monotropism is the tendency for our interests to pull us in more strongly than most people."c3 Behind it is a picture of the mind as an "interest system". Everyone has many interests that steer attention, but in a monotropic mind "fewer interests tend to be aroused at any time, and they attract more of our processing resources, making it harder to deal with things outside of our current attention tunnel."c3
An attention tunnel is that state of deep focus on one interest. The opposite tendency, attention spread more thinly over many interests at once, is called polytropism, and a mind that works that way is polytropic.1,c3 Megan Griffith gives the image most writers reach for: polytropic thinkers use attention "like a lantern", while monotropic thinkers, who she says often include autistic people, ADHDers and people with OCD, "tend to think more like a flashlight."c4
Writers use the idea to tie together experiences that diagnostic manuals list separately. Murray reads autistic inertia, the difficulty of starting, stopping or changing direction, as following from it. The same account covers finding one sensory channel at a time easier, needing more time to process conversation, and hearing the literal meaning of a saying first.c3 In Murray's words, "life as a monotropic person in a polytropic world is often unstable", and being pulled out of an attention tunnel is "deeply destabilising."c3
Pete Wharmby, who discussed the idea with Fergus Murray, writes that autistic people "approach the world like laser beams, I suppose, rather than wider car headlights or floodlights". Deep in an attention tunnel he has missed "phone calls, knocks at the door and my own body demanding that I eat or drink something immediately".c6 Luke Beardon, writing about anxiety, suggests that the tunnel narrows under stress: "the more anxious you are, the more you might align to being monotropic", while in calm states its impact may lessen.c7
Monotropism is an idea about attention. It says some people's attention goes into just a few interests at a time. Each interest pulls hard, and little is left for anything else. Fergus Murray is an autistic science teacher. Murray says monotropism means our interests pull us in more strongly than they do for most people.c3
People call this deep focus an "attention tunnel". The opposite is called polytropism. A polytropic mind spreads attention over many things at once.1,c3 Megan Griffith compares it to light. Polytropic thinkers use attention like a lantern. Monotropic thinkers use it more like a flashlight.c4 She says this often includes autistic people and people with ADHD.c4
Murray uses the idea to explain many autistic experiences. One is autistic inertia, which means finding it hard to start, stop or switch. Others are taking in one sense at a time and needing more time in a conversation.c3 Murray says being pulled out of an attention tunnel feels very upsetting.c3
Pete Wharmby says autistic attention is like a laser beam, not a wide floodlight.c6 Deep in a tunnel, he has missed phone calls, knocks at the door, and even feeling hungry or thirsty.c6 Luke Beardon thinks the tunnel may get narrower when a person is anxious, and matter less when they are calm.c7
How the writers who developed or use the idea describe it. This reports usage; the research is in later sections.
This part tells you how people use the word. It is not a science finding.
Where it came from Established
Dinah Murray, who had written a PhD on language and interests, first presented the idea at the Durham autism conference in 1992, in a paper called "Attention Tunnelling and Autism".c1,c2 In autism, she wrote, "arousal is monotropic or focussed in only one interest at a time."c1 According to the theory's website, the word monotropism was coined on her behalf by a friend, Jeanette Buirski, from Greek roots meaning "single way" or "in one direction".c2 In Australia, Wenn Lawson, diagnosed autistic in 1994, was working on similar ideas about "single focused attention"; the two met at a conference in 1998.c2
The main statement of the theory is a 2005 paper in the journal Autism by Murray, the mathematician Mike Lesser and Lawson, then publishing as Wendy Lawson.1,c2 It argued that unusual strategies for allocating attention are central to autism, and that the first two diagnostic criteria of the time (in DSM-IV and ICD-10) follow from the "restricted range of interests" named in the third.1 The authors proposed that attention is limited and that the way people spread it ranges from diffuse light to a torch beam. They suggested that these strategies are normally distributed and largely genetic, and that a diagnosis of autism picks out people at the tight-focus end; the paper offers no evidence for the genetic part.1 The monotropic tendency meant having few interests highly aroused, the polytropic tendency many interests less highly aroused.1 The paper drew on research, the diagnostic criteria, and autistic people's own accounts, one of its authors among them.1 Fergus Murray describes all three authors as autistic; when the paper came out, only Lawson had a diagnosis.c3
The paper offered a reading of existing findings and no new data: "We are not attempting to establish new facts about autism but trying to interpret what is already known."1 It named weak central coherence as the existing theory closest to its own and treated difficulty shifting attention as a corollary of intense focus on a task.1 It ended with advice for practice, beginning "Start where the child is", and a wish for "more research into monotropism".1 Lawson's doctoral thesis on the idea became the book The Passionate Mind (2011).c2 Fergus Murray's 2018 article in The Psychologist carried it to a wider readership, and Murray set up monotropism.org in 2022 with an archive of Dinah Murray's work.c3 Dinah Murray died in 2021.c3
Dinah Murray studied language and interests. She first shared the idea at an autism meeting in England in 1992.c1,c2 A friend of hers made up the word monotropism. It comes from Greek words meaning "one way".c2 In Australia, Wenn Lawson had similar ideas. Lawson is autistic, and the two met in 1998.c2
In 2005, Murray, Lawson and Mike Lesser wrote the main paper about the idea.1 They said the way autistic people use attention is at the center of autism. They said everyone falls somewhere between a narrow beam and a wide glow. They guessed that autistic people sit at the narrow end.1 The paper did not report any new experiments. The authors said they were explaining what was already known.1 They gave advice, such as "Start where the child is." They also asked for more research.1
Fergus Murray, Dinah's child, wrote about the idea in a magazine in 2018. Many people read it.c3 Dinah Murray died in 2021.c3
The origin rests on two dated publications, the 1992 conference paper and the 2005 journal paper, both read in full. Who coined the word, and the later history, come from the theory's own website.
An older theory that autistic people tend to process details rather than draw them into an overall picture.
We know where the idea comes from. It is in a talk from 1992 and a paper from 2005, and we read both.
Why it resonates Community
Many autistic people say the idea describes them. Fergus Murray writes that autistic people "have always responded very positively to the theory", though not in every case, and quotes Mary Doherty: "Finally, an all embracing theory of #autism which perfectly explains my own lived experience".c3 Murray also quotes Patrick Dwyer, writing in 2021, that monotropism is "within the autistic adult community, probably the dominant theoretical approach towards understanding what autism is."c3
Part of the appeal is who made it, and how. Wenn Lawson calls it "the one theory voiced, experienced and researched by autistic people".15 Fergus Murray contrasts it with the "pathologising, deficit-based framing of the best-known theories of autism", and writes that the 2005 paper explained autism "without supposing any deficit on the part of autistic people".c3 Daniel Burford, writing for newly diagnosed adults, calls the idea "elegant" and says "it came from autistic people rather than being done to us".c8 Beardon links its growing popularity among autistic people to its having been "developed by autistic academics".c7
Its popularity grew online. The Monotropism Questionnaire, released under a Creative Commons license, spread on TikTok while its validation paper was still awaiting peer review, and Murray reports that many autistic people found its questions validating.c3 Murray counts more than 590 citations of the 2005 paper since 2019, against 200 in the years before, a measure of attention to the paper rather than of support for the theory.c3
Writers also draw practical advice from it. Because monotropic attention lets people "dig into our passion in one long tunnel", Griffith suggests that AuDHD people look for work they feel passionate about, and that they get detail work done "in one go".c4 Fergus Murray's advice to those around autistic people is to "become part of the attention tunnels" rather than pull the person out of them.c3
Many autistic people say the idea fits them. Fergus Murray says most autistic people have liked it, though not all.c3 One researcher wrote in 2021 that it was probably the most popular idea about autism among autistic adults.c3
People also like that autistic people made it. Wenn Lawson calls it the one theory made and studied by autistic people.15 Fergus Murray says it explains autism without calling autistic people broken.c3 Daniel Burford likes that it "came from autistic people".c8 Beardon says this is part of why it is popular.c7
A quiz about monotropism spread on TikTok, before scientists had checked it.c3 Griffith suggests that people who are autistic and have ADHD look for work they love.c4 Fergus Murray says others should join a person's attention tunnel, not pull them out.c3
From autistic writers' accounts of how the idea has been received. Whether it is right is a research question, covered in the next sections.
This part tells you what autistic writers say about the idea. It does not tell you if the idea is right.
Measuring monotropism Emerging
Formal research on monotropism is recent and small, and most of it uses one questionnaire. The Monotropism Questionnaire has 47 items, written by a group of autistic adults from their lived experience and academic expertise.2 In its validation study, 1,110 people completed it online, 756 of them autistic. An exploratory factor analysis found eight dimensions, scores were internally consistent, and they correlated with two short autism-trait questionnaires at r above .61.2 Autism and ADHD were each associated with higher scores.2 The study was posted as a preprint in 2023; in the searches made for this entry, no peer-reviewed version had appeared by October 2026.2
A Polish version was tested in 108 adults referred for ADHD or autism assessment, about two thirds of them women. The total score was internally consistent (Cronbach's alpha .91), subscales were moderately to highly consistent, and a confirmatory factor analysis fitted well. Some subscales rose with ADHD symptoms and autistic traits. No statistically significant sex difference was found, in a sample with only 38 men. The authors call the adaptation preliminary.3 In a second study by the same author, of 101 adults in a diagnostic assessment, monotropism scores did not statistically separate three profiles (mainly ADHD, mixed ADHD and autism, and few traits), though they were highest in the mixed profile.4 In a preprint survey of 111 autistic and 39 non-autistic adults, the autistic group reported more monotropism, more hyperfocus and more inattention.5
Scientists have only started to study monotropism. Most studies use one quiz, the Monotropism Questionnaire.2 Autistic adults wrote its 47 questions.2 In the first study, 1,110 people took it online.2 Autistic people and people with ADHD tended to score higher.2 This study is a preprint. That means other scientists have not checked it yet.2
A Polish version was tried with 108 adults who were being tested for ADHD or autism. It seemed to work well, but the authors say it is an early version.3 Another study from the same scientist did not find that scores could tell groups apart.4 In one more early study, autistic adults reported more monotropism than others.5
One questionnaire, written with autistic adults, tested in three groups of people. All are self-report surveys at one point in time. The largest study and one other are preprints, and the two clinic studies come from one author, both drawing on adults in diagnostic assessment, so they count as one.
A questionnaire that rises with autism-trait scores shows that the same people report both. It cannot show on its own that monotropism produces the traits, and an association with ADHD in people seeking a diagnosis does not show that monotropism explains the overlap.
A paper made public before it has been checked by other researchers (peer review).
Only a few studies exist. They all use one quiz that people fill in about themselves. Some have not been checked by other scientists yet.
People who report autistic traits also report monotropism. That does not prove monotropism causes the traits.
Laboratory tests Emerging
Tests outside questionnaires are few and small. The two framed around monotropism looked for slower disengagement and for brain-wave signs of hyperfocus, and did not detect group differences; samples this small can miss a real difference. An eye-tracking study framed around monotropism tested 46 autistic and 28 non-autistic children aged 2 to 4. It found no evidence that the autistic children were slower to pull their gaze away from what they were looking at, which the authors call "sticky attention".6 Within the autistic group, sticky attention went with more caregiver-reported sensory over-responsiveness, sensory seeking and enhanced perception. A trend that did not reach significance, and exploratory analyses, suggested the autistic children might return more often to images they had already seen ("springy attention"); the authors say this needs confirming. Springy attention went with lower cognitive ability scores and more caregiver-reported sensory under-responsiveness.6 These are correlations within the children studied, not effects of monotropism. Older studies not framed around the theory are mixed. In one, of 104 infants, about half of them with an autistic older sibling, the small group later diagnosed took longer to disengage their gaze at 14 months, though not reliably at 7 months. Their lack of improvement between those ages was also seen, less consistently, in infants who later had other developmental concerns.16
The same group studied 18 autistic and 22 non-autistic adolescents. The autistic teenagers and their caregivers reported more hyperfocus. Brain-wave markers of hyperfocus and a behavioral test of attention capture did not differ between the groups, and the different kinds of attention measure were mostly unrelated to one another.7 Self-reported hyperfocus went with self-reported misophonia (strong reactions to particular sounds) and sensory over-reactivity.7 The authors suggest that some tightly controlled laboratory tasks may struggle to capture autistic attention in daily life. They also cite other findings that autistic attention may have greater capacity or be unusually prone to involuntary capture.7
A few scientists have tested attention in the lab. One study tracked the eyes of young children aged 2 to 4.6 It did not find that autistic children were slower to look away from things.6 But the study was small, and small studies can miss real differences.
The same team studied 40 teenagers. Autistic teens said they hyperfocus more, and their parents agreed.7 But brain-wave tests found no difference between the groups.7 The scientists think lab tests may miss how attention works in real life.7
Among the studies found as of October 2026, the only laboratory tests framed around monotropism are two small studies from one research group. Neither found group differences on the laboratory attention measures, though the questionnaires in one did. Older work on disengaging attention is mixed and came mostly from infants with an autistic older sibling.
A brain-wave response recorded from the scalp, timed to an event such as a picture appearing.
We found only two small lab studies, both from one team. Their lab tests found no differences, though a quiz in one study did.
Flow and inertia Emerging
Monotropism is often discussed alongside flow, the state of complete absorption in an activity, and alongside autistic inertia. In interviews with 24 autistic adults, participants called inertia "the single most disabling part of being Autistic", yet also described the joy of being completely immersed in a task. They said everyone has some inertia, but that its intensity may be especially hard for autistic people, and the authors present it as both disabling and enabling.8 A second paper from the same interviews found that accounts of immersion closely matched descriptions of flow, hyperfocus and monotropism. Immersion could be all-encompassing and hard to balance with the rest of life, but participants were glad of it because they could be themselves.9 Most of the participants were white, well-educated, employed women who used traditional forms of communication.9 In a preprint study, not yet peer reviewed, 13 autistic adults described their attention as sequential and deeply engrossed, with themes the authors named "Interruption is Devastating" and "Interest Engagement as a Sanctuary"; the authors note that these resonate with monotropism.12
A 2026 scoping review of 43 publications on autism and ADHD, including empirical studies, reviews and other writing, found the most overlap among autistic inertia, monotropism and hyperfocus. In its conceptual synthesis, which is not a pooled test, monotropism is rigid, directed focus, while flow adapts flexibly to challenges, and inertia hinders starting and switching tasks where flow runs smoothly.10 A conceptual paper whose authors include Damian Milton and Fergus Murray proposes an "autistic flow theory". It argues that autistic flow may differ from standard models of flow, and that difficulty keeping and leaving flow calls for study of how people move into and out of it.11
Flow is when you are so absorbed in something that time seems to vanish. Scientists talked with 24 autistic adults.8 Many said inertia was the hardest part of being autistic.8 But they also loved getting lost in a task.8 Their stories matched ideas about flow, hyperfocus and monotropism.9 Most of these adults were white women with a good education.9
A review of 43 studies and papers found these ideas overlap a lot.10 It said monotropism is a firmer kind of focus. Flow can bend more as a task changes.10 Some writers, Fergus Murray among them, have proposed a theory of "autistic flow".11
Interview studies and a scoping review that mixes empirical and conceptual work. They describe experiences in the theory's terms but do not test whether monotropism causes them. Two of the papers share one interview sample of mostly white, well-educated women.
A state of full absorption in an activity, in which time and surroundings fade from notice.
These studies are mostly interviews. They show how people describe their attention, not what causes it.
Debates Emerging
Whether monotropism is a theory of autism or of attention in general is unsettled. The 2005 paper already treats it as a range along which everyone varies, with autism at one end.1 Fergus Murray suggests the trait may follow a normal distribution, so that "some people are closer to having autistic minds than others without qualifying as autistic themselves".c3 The questionnaire studies found higher scores with ADHD as well as autism, and the author of the Polish studies calls for research on monotropism as an attentional dimension that crosses diagnoses, though in that study it did not separate the groups.2,4 Griffith applies it to ADHD and OCD as well as autism.c4 No study found as of October 2026 has included people with OCD.
On AuDHD, the theory's own writers are cautious. Fergus Murray and Sonny Hallett write that it is "too early to say with any confidence" that autism and ADHD share a common root in monotropism, and that the ADHD habit of "hopping mentally from one thing to another" is "a little harder to reconcile" with it. They suggest, calling it speculative, that ADHD might arise from a fairly monotropic style combined with other factors, such as difficulty reaching flow states.c5
A second argument is about evidence. Lawson describes the theory as "more descriptive (currently)", while believing it explains all the aspects of autistic experience.15 Fergus Murray writes that its originators never got psychologists to do "the empirical work needed to rigorously test monotropism".c3 Burford, who shares the enthusiasm, calls it "mostly an idea" that "nobody has gone on to demonstrate", and advises: "Just know it's a lens rather than a fact, and don't let anyone hand you it as proof of anything."c8 The autism scholar Nick Chown, in a book that evaluates autism theories one by one, proposes a synthesis in which "the single attention/monotropism thesis, which speaks to both attention and perception, can play a lead role", combined with the preference for detail from central coherence theory. He stresses that the synthesis is his own opinion and "most unlikely to be held by many other autism specialists".c9 Some researchers instead reread older findings through it: a review of 17 verbal-fluency studies argues that their wide variation, read by the original authors as deficit, fits monotropism, which expects wide individual variation.13 The authors call this "an exercise in reframing"; it reinterprets past results after the fact and does not test the theory, since an account that expects wide variation fits almost any spread of results.13 Among the studies found as of October 2026, the direct tests are the questionnaire studies and two small laboratory studies from one group, and the laboratory predictions (slower disengagement, brain-wave signs of hyperfocus) were not borne out in the samples tested.2,6,7
The idea is often paired with the double empathy problem. Fergus Murray borrows Damian Milton's phrase "a mismatch of salience": autistic people miss much that others register, but "other people probably miss just as many things".c3 In a 2025 update Murray adds that monotropic people "may communicate very effectively with each other".c3 A 2025 perspective article uses both ideas to argue for support built around autistic people's own goals and interests, and notes that empirical work on whether its approach serves either idea is still missing.14
Is monotropism about autism only, or about everyone? The 2005 paper said everyone falls somewhere on the scale.1 People with ADHD also scored high on the quiz.2 Fergus Murray and Sonny Hallett say it is too early to know if autism and ADHD share this root.c5
Some people say the idea needs more testing. Wenn Lawson says it mostly describes experience for now.15 Fergus Murray says scientists never did the work to test it properly.c3 Burford calls it "mostly an idea" that nobody has proved yet. Burford says to treat it as a way of looking, not a fact.c8 Nick Chown studies ideas about autism. Chown thinks monotropism could be the main part of a bigger theory. Chown says most other experts would probably disagree.c9
Some people link it to the double empathy problem. That is the idea that autistic and non-autistic people misunderstand each other both ways. Fergus Murray says autistic people miss some things, but other people miss just as many.c3
The positions come from the theory's authors, community writers and argument papers. The evidence they draw on is the small body of research in the sections above.
People argue about these questions. The research behind the arguments is small.
Sources
Research
- 1Murray D, Lesser M, Lawson W. Attention, monotropism and the diagnostic criteria for autism. Autism, 2005. https://doi.org/10.1177/1362361305051398
- 2Garau V, Murray AL, Woods R, et al. Development and Validation of a Novel Self-Report Measure of Monotropism in Autistic and Non-Autistic People: The Monotropism Questionnaire. Preprint (OSF Preprints), 2023. https://doi.org/10.31219/osf.io/ft73y
- 3Papińska A, Brzezińska A, Moszoro-Yilmaz M. Monotropic processing, ADHD symptoms, and autistic traits in adults: a preliminary adaptation of the Monotropism Questionnaire. Psychiatria Spersonalizowana, 2026. https://doi.org/10.5114/psychs.2026.164911
- 4Papińska A. Does monotropism bridge ADHD and ASD? A latent profile analysis in adults. Psychiatria Spersonalizowana, 2026. https://doi.org/10.5114/psychs.2026.159107
- 5Dwyer P, Dakakni M, Faris L, et al. Monotropism, Hyperfocus, or Autotelic Personality? Attention Styles and Autism. Preprint (PsyArXiv), 2025. https://doi.org/10.31234/osf.io/myufx_v2
- 6Dwyer P, Sillas A, Prieto M, et al. Hyper-focus, sticky attention, and springy attention in young autistic children: Associations with sensory behaviors and cognitive ability. Autism Research, 2024. https://doi.org/10.1002/aur.3174
- 7Dwyer P, Sillas A, Saron CD, et al. Investigating autistic hyperfocus and monotropism: Limited convergence of event-related potentials, laboratory tasks, and questionnaire responses. Research in Autism, 2025. https://doi.org/10.1016/j.reia.2025.202683
- 8Rapaport H, Clapham H, Adams J, et al. 'I live in extremes': A qualitative investigation of Autistic adults' experiences of inertial rest and motion. Autism, 2024. https://doi.org/10.1177/13623613231198916
- 9Rapaport H, Clapham H, Adams J, et al. "In a State of Flow": A Qualitative Examination of Autistic Adults' Phenomenological Experiences of Task Immersion. Autism in Adulthood, 2024. https://doi.org/10.1089/aut.2023.0032
- 10Pace-Tonna C, Murtaza M, Rodak T, et al. Flow and Similar Attentional States in Autism and ADHD: A Scoping Review of Similarities and Differences. Perspectives on Psychological Science, 2026. https://doi.org/10.1177/17456916261470783
- 11Heasman B, Williams G, Charura D, et al. Towards autistic flow theory: A non-pathologising conceptual approach. Journal for the Theory of Social Behaviour, 2024. https://doi.org/10.1111/jtsb.12427
- 12Poole D, Molloy H, Butnicu B, et al. Exploring the phenomenology of autistic attention. Preprint (PsyArXiv), 2026. https://doi.org/10.31234/osf.io/b3exd_v1
- 13Grissom A, Finke E, Zane E. Verbal fluency and autism: Reframing current data through the lens of monotropism. Autism Research, 2024. https://doi.org/10.1002/aur.3071
- 14Brosnan M, Camilleri LJ. Neuro-affirmative support for autism, the Double Empathy Problem and monotropism. Frontiers in Psychiatry, 2025. https://doi.org/10.3389/fpsyt.2025.1538875
- 15Lawson W. Research by autistic researchers: an "insider's view" into autism. The autistic way of being. Frontiers in Psychiatry, 2025. https://doi.org/10.3389/fpsyt.2025.1664507
- 16Elsabbagh M, Fernandes J, Webb SJ, et al. Disengagement of Visual Attention in Infancy is Associated with Emerging Autism in Toddlerhood. Biological Psychiatry, 2013. https://doi.org/10.1016/j.biopsych.2012.11.030
Community sources
- c1Murray DKC. Attention Tunnelling and Autism. Living with Autism: The Individual, the Family, and the Professional (Durham conference proceedings), 1992. https://monotropism.org/dinah/attention-tunnelling-and-autism/
- c2Murray F, Lawson W. History of Monotropism. monotropism.org, 2022. https://monotropism.org/history/ Fergus Murray's site
- c3Murray F. Me and Monotropism: A unified theory of autism. The Psychologist, 2018 (2025 update on the same page). https://www.bps.org.uk/psychologist/me-and-monotropism-unified-theory-autism Fergus Murray's site
- c4Griffith M. Welcome to AuDHD: How to Survive (and Thrive) as an Adult with Autism and ADHD. Jessica Kingsley Publishers, 2026. Chapter 4, "How to Succeed at Work", section "What kind of job works best for AuDHDers?". Megan Griffith's site
- c5Murray F, Hallett S. ADHD and Monotropism. monotropism.org, 2023. https://monotropism.org/adhd/ Fergus Murray's site
- c6Wharmby P. Untypical: How the World Isn't Built for Autistic People and What We Should All Do About It. Mudlark, 2023. Chapter 4, "More Than a Hobby". Pete Wharmby's site
- c7Beardon L. Avoiding Anxiety in Autistic Adults: A Guide for Autistic Wellbeing. Sheldon Press, 2021. Chapter 2, "Experiencing anxiety".
- c8Burford D. The Unmasking Years: The Map No One Gave You After Your Diagnosis. Narrow Lake, 2026. Chapter 5, "Meeting Yourself for the First Time".
- c9Chown N. Understanding and Evaluating Autism Theory. Jessica Kingsley Publishers, 2016. Chapter 7, "The Weak Central Coherence of Autism Theory", section "Synthesis of existing autism theory".