Enablement and treatment theory
Last updated: October 31, 2025
John Whyte and a multiprofessional team from several North American rehabilitation centres have worked on rehabilitation theory for two decades. Early in their work, they distinguished between enablement theories and treatment theories. They have applied their concept of treatment theory to develop a principled approach for describing all rehabilitation treatments, known as the Rehabilitation Treatment Specification System, or RTSS. I strongly believe in the power of theories to improve clinical practice, research, and the understanding of rehabilitation, and I have discussed this on a page entitled ‘Rehabilitation Theory: What and Why?‘ In this post, I will discuss their ideas and the system.
Table of Contents
Introduction
Rehabilitation developed rapidly between 1914 and 1918 in response to the huge number of injured combatants and civilians. In 1918, Major John Todd, a Canadian, wrote about rehabilitation, “It is well understood on this continent because of the many very excellent articles upon ‘rehabilitation’ which have appeared not only in scientific and semi-scientific publications but in the popular press.” I have not found any articles earlier than 1918; however, Major Todd’s comment suggests that many were written during the war.
Rehabilitation was developed on a purely practical basis, with, in John Todd’s article, a firm commitment to achieving social outcomes and equity between sexes, classes, and types of loss; he emphasised that war was not the only disabling disorder. There was no theory underlying the development of rehabilitation. The primary medical theory at the time was the biomedical approach to health, and rehabilitation was considered an integral part of it.
The first published theory that greatly influenced rehabilitation was the biopsychosocial model, proposed in 1977 by George Engel in his paper, The Need for a New Medical Model: A Challenge for Biomedicine.
The World Health Organisation and others started using the biopsychosocial model of illness as a conceptual framework for rehabilitation, and, with modifications, it remains the fundamental foundation for analysing disabling conditions. Many pages on this site discuss various aspects of its use.
In 1978, Gary Kielhofner, an occupational therapist, recognised that general systems theory was applicable to rehabilitation when he published General systems theory: implications for theory and action in occupational therapy. He was very successful in his approach, developing the Model of Human Occupation, which influenced occupational therapy, particularly in the United States. Unfortunately, his ideas did not have a significant impact on the broader field of rehabilitation.
In 2008, John Whyte emphasised the need for theories in his paper, A Grand Unified Theory of Rehabilitation (We Wish!). The 57th John Stanley Coulter Memorial Lecture.
In 2014, he wrote a special communication on Contributions of Treatment Theory and Enablement Theory to Rehabilitation Research and Practice. I will start by considering the Enablement theory, then the Treatment theory, and last the Rehabilitation Treatment Specification System. I will end by discussing the strengths and weaknesses of his systematic approachand seeing how it applies to spinal cord injury rehabilitation.
Enablement theory.
A quick Google search identified papers in 2003 about developing an Enablement Theory: “The theory of enablement indeed is but a beginning. It is an effort to build a theoretical framework that links with new ways of doing empirical research with general assumptions about the nature of the phenomena.” This use of the term appears to have fallen out of use.
The Oxford English Dictionary [OED] describes the meaning of enablement as, “the action of giving someone the authority or means to do something,” which is a reasonable synonym for rehabilitation.
In his 2014 paper, Contributions of Treatment Theory and Enablement Theory to Rehabilitation Research and Practice, John Whyte describes enablement theory, saying, “enablement theory hypothesizes the nature and strength of the relations among clinical characteristics … and predicts where changes will occur in response to perturbations or interventions elsewhere”.
He employs the biopsychosocial framework, exemplified by the World Health Organisation’s International Classification of Functioning, in his paper. He suggests that enablement theory examines or describes relationships between factors at different levels, such as between an impairment and a relevant activity. Based on this, and with adequate data, the theory predicts that changing one factor will influence another, usually at a higher level. For example, enhancing sensory feedback from the legs might decrease the number of falls a person experiences.
If I have understood his papers correctly, the enablement theory fundamentally suggests that there are relationships between variables within the biopsychosocial model of illness such that altering one lower-level variable, such as an impairment, will have a predictable effect on a higher-level variable, such as an activity. Accordingly, in a given situation, one can predict that improving variable A by 20% will enhance variable B by 10%.
Treatment theory.
Treatment theory, in contrast to enablement theory, is concerned with how one can alter a variable. Taking the last example, it will suggest how to improve variable A. The theory is used to analyse the components of the treatment and their characteristics.
He describes treatment theories thus: “Treatment theory refers to a class of specific theories that specify mechanisms by which the active ingredients of a treatment produce change in the treatment target, the aspect of function that is directly impacted by the treatment.” You will note that treatment theory may encompass a group of theories.
This theoretical approach builds on the initial analysis or formulation, which is based on enablement theory. John Whyte argues that enablement theory allows one to predict that altering a variable will improve another variable, and that treatment theories may identify one or more interventions that should modify the variable.
Treatment theory also encompasses directly addressing a relevant variable as an end goal. For instance, improving walking might involve treatment aimed at increasing muscle strength and sensory feedback, with the aim of enhancing gait. Alternatively, one could focus on targeting walking directly by using interventions that directly influence gait, such as practising on a treadmill or uneven terrain. It likely also involves providing feedback on the observed walking.
The theory is further developed to define the treatment accurately.
If I have understood his paper accurately, treatment theories encompass both what interventions will alter a target variable and a framework for analysing and characterising the intervention to standardise it.
Rehabilitation Treatment Specification System
The main output from treatment theory is the Rehabilitation Treatment Specification System, RTSS.
This was described by Tessa Hart et al. in a special communication in 2018, titled “A Theory-Driven System for the Specification of Rehabilitation Treatments.” The problem they identify is that “Because we cannot measure what we cannot define, we are hard pressed to characterize the types, mixes, doses, schedules, and intensities of rehabilitation administered to patients with particular functional problems or clusters of problems – a necessary step for rigorous research and replication, clinical training, and consistent, efficient clinical care.”
The group is exceptionally ambitious, aiming for the system to be applicable to all rehabilitation interventions provided by any rehabilitation professional in any setting or format. It is designed to serve as a standard, universal descriptor of rehabilitation treatment. They contrast their theory-driven, top-down approach to the typical approach, characterised as extracting the relevant components from observing the treatment.
They identify three classes of information:
- The intended target, the proximal, immediate variable to be changed. If the overall goal is to improve a secondary variable, this is not included.
- The ‘ingredients’, the actions or other activities given with the intention of causing change
- The mechanism that links the actions to the change.
They have further classified treatment into one of three broad groups:
- Those that target organ functions. These affect impaired organs, such as muscles, or replace or enhance their functioning (e.g a prosthesis, a hearing aid, an orthosis)
- Those that target ‘skills and habits’. These affect activities, and typically involve learning, practice, and repetition.
- Those that target ‘representations’. These concern abstract concepts such as knowledge, attitudes, and emotions.
The authors recognise that there are difficulties in separating assessment (i.e., data collection) from treatment. The outcomes of an assessment, such as a formulation that helps the patient understand their situation, can be very effective as a form of treatment. Conversely, patients often provide significant information while undergoing treatment.
Suppose I have understood the method correctly, for each treatment. In that case, one needs to identify the immediate target and how it will alter the target, and then describe the treatment in detail, including all its presumed components. I am uncertain whether the nature of the disease causing the decline in the target variable is part of the process.
Comment – enablement theory.
The principle of the enablement theory is evidently correct. One must have hypotheses about what the relationships are between variables. Some are easy to investigate and even quantify, such as the relationship between quadriceps muscle strength and the ability to stand and walk, as well as walking speed.
However, most activities are affected by many variables. For example, pulmonary disease might limit walking speed, and increasing muscle strength may have no effect. Alternatively, if someone is blind or afraid of walking outside, increasing muscle strength may also be ineffective. An activity like dressing is influenced by a wide range of factors – emotional, motivation, style of clothes worn, sensory function in the hands, initiation and sequencing of actions, etc.
More broadly, as Gary Kielhofner noted, the biopsychosocial model of illness presents a hierarchy of systems that includes organs, the body, goal-oriented behaviours, and social roles and interactions. In these systems, the interactions among variables are complex, often being bidirectional, interactive, and non-linear. Therefore, even if the relationship between two variables is strong in most people, one cannot assume that changing one will necessarily lead to the expected secondary effects.
Furthermore, contextual variables will often have a significant and dominant effect on most activities. Therefore, providing someone with a wheelchair and possibly teaching them how to use it is an effective treatment. Another example is modifying the house. Since there is no specific target in the patient, this makes it difficult to translate into a treatment theory.
I believe the most significant opportunity for systematic research is to identify how changing contextual factors influence a person’s outcomes. For example, W C Mann et al. in 1999 demonstrated in a trial that providing environmental interventions and assistive technology improved patient outcomes and saved resources equivalent to the cost of the equipment.
Other projects could investigate the likely significant effects of interpersonal relationships on the response to therapy.
Comment – treatment theory and RTSS.
It is obvious that interventions should be based on evidence showing they produce their necessary immediate, direct effects. Understanding the mechanism behind the benefit is helpful, but often effectiveness itself prompts further research to uncover the mechanism. Many drug treatments have followed this approach.
Therefore, I question the emphasis placed on understanding the mechanism and would prioritise having evidence that it produces the desired effect. Naturally, if someone identifies a mechanism that could have an impact, then it should be investigated to determine whether it does.
I was pleased to see that the theory accounts for various influences, such as providing information while strengthening a muscle. However, the entire system depends on an intuition or belief that certain actions do or might have an effect, and all related actions are considered irrelevant. For example, I suspect that the enthusiasm and personality of a therapist have a significant impact on nearly all variables, but if this is overlooked, trials may wrongly attribute success to a measured variable rather than the unmeasured one.
An example may help. In 2004, a randomised controlled trial involving 300 stroke patients in a single stroke unit concluded that “Training care givers during patients’ rehabilitation reduced costs and caregiver burden while improving psychosocial outcomes in care givers and patients at one year. “ A follow-up multicentre trial involving 931 concluded that “There was no difference between the LSCTC and usual care with respect to improving stroke patients’ recovery, reducing caregivers’ burden, or improving other physical and psychological outcomes, nor was it cost-effective compared with usual care.” [LSCTC = the London Stroke Carer Training Course used in the first trial.]
My interpretation is that the team involved in the single centre was committed, enthusiastic, and motivated, and their style of interaction led to the benefit. This was also observed in a smaller trial of occupational therapy for people with dementia in the Netherlands; when the system used in the research centre was implemented across all centres, no benefit was seen.
My other concern about the theory-based descriptive system is that it is overly complex to be practical, even within research.
Spinal cord injury rehabilitation.
My question to John Whyte and his colleagues is: How would you apply and utilise this for spinal cord injury rehabilitation?
I asked myself, how does rehabilitation have such a huge effect when there is no change in the patient’s losses? My thought and analysis led me to the concept of Rehabilitation Thinking, as published in the title, “Is rehabilitation’s unifying expertise its holistic scope and cognitive approach to the patient’s problems? An exploration.” I have published a page on Rehabilitation Thinking on this site.
From my perspective, theories of enablement related to most bodily variables are unlikely to influence rehabilitation after spinal cord injury, except for psychological and emotional factors. The main interventions concentrate on the physical and social environment, with teaching self-management habits being important but secondary. Treatment theories and descriptions will also have limited impact, as many interventions depend on the environment and are often customised to the individual.
Conclusion
Rehabilitation theories are essential; without developing, testing, and evaluating them, the field will stagnate. The work and, more importantly, the thinking by John Whyte and all his colleagues are crucial. No theory is ‘correct’, and all evolve over time. True paradigm shifts are rare. Regardless of their success, theories drive change, and I am aware of ongoing research and application of the Rehabilitation Treatment Specification System in the UK.
The term ‘enablement theories’ is fitting, and exploring their inter-relationships is vital, as it may reveal factors we have overlooked that still influence outcomes. My only suggestion is to seek evidence demonstrating the broad and general benefits of assistive technology, as well as environmental factors, including their cost-effectiveness. Additionally, investigating the role of hope would be valuable. I look forward to reading more about enablement and treatment theories as the work develops.