Stimulating injury-preventive behaviour in sports: the systematic development of two interventions

Background In addition to the beneficial health effects of being active, sports are also associated with a risk of sustaining injuries. To avoid the occurrence of sports injuries, preventive measures can be applied. The aim of the current article is to provide insight into the systematic developmental process of two evidence-based interventions designed to stimulate injury-preventive behaviour in runners and skiers, in which Intervention Mapping (IM) and Knowledge Transfer Scheme (KTS) are used as developmental protocols. However, the ultimate steps in the process are adjusted to meet requirements of the intervention and the target group. Methods Using a three-step process, we developed two interventions to stimulate injury-preventive behaviour in runners and skiers. Sports participants, sports experts and behaviour experts contributed throughout steps two and three of the developmental process. Results In step one we started with a problem statement in which we used information about the number and the burden of running-related and skiing-related injuries in the Netherlands. In step two, in-depth research was performed using four research strategies. During this step we tried to answer the following question: Which preventive measures or actions should be executed to prevent what injuries by whom, and how should we do that? A desk research/systematic review of the literature, expert meetings, target user surveys, and target user focus group meetings were conducted. In step three of product development, both interventions were developed. During the developmental process, co-creation sessions with target users were held. Before finalizing the interventions, pre-tests of the interventions were performed with target users. Conclusions Through a three-step approach, we developed two interventions to stimulate injury-preventive behaviour in runners and skiers. To develop an intervention that fits the needs of the target population, and will be used by them, it is necessary to involve this population as soon and as much as possible. Several steps in the IM and KTS protocols have thus been adjusted in order to establish an optimal fit between intervention and target group.


Background
Running and winter sports like skiing and snowboarding (hereafter referred to as skiing) are popular forms of exercise among the Dutch population [1,2]. While being active through running and skiing has undeniable beneficial health effects, both sports are also associated with a high risk of musculoskeletal injuries [3][4][5][6][7][8][9]. Additionally, skiers are at a high risk for traumatic brain injury [7][8][9]. In both sports, the level of expertise is one of the associated risk factors for injuries [4,10,11].
To safeguard (novice) sports participants against injuries, and consequently from withdrawal from their activities, the use of effective injury-preventive measures is necessary. The use of effective measures often requires a behavioural change in sports participants. For some sports, the use of effective injury-preventive measures, such as helmets in bicycle races or shin guards in football, have been made compulsory. The enforcement of these compulsory measures and the risk for (external) penalties are motivating factors to stimulate injurypreventive behaviour. However, in the case of running, the implementation of compulsive injury-preventive measures is difficult, and none exist for adult skiers. Therefore, significant efforts have to be made to accomplish a behavioural change in order to increase the use of effective measures and subsequently reduce the number of running-related and skiing-related injuries.
With running, some interventions have been recently implemented, leading to promising results in stimulating injury-preventive behaviour and preventing runningrelated injuries (RRIs) [12,13]. Hespanhol et al. [12] observed no effects on determinants and actual preventive behaviour, but RRIs were prevented. An intervention developed by Adriaensens et al. (Dutch Consumer Safety Institute) was effective in stimulating injury-preventive behaviour among runners [13], but was very timeconsuming.
To prevent injuries or reduce injury risk in skiing, several educational interventions have been used in the past [14,15]. According to a systematic review by Hume et al. [10], the effectiveness of educational interventions is unclear due to the diverse nature of the education campaigns and target populations, but could possibly be beneficial.
Although several interventions have therefore been recently developed for runners and skiers, it is, to our knowledge, unknown how these interventions were developed. Insight into the developmental process of an intervention can provide knowledge and practical guidance for others in their developmental process [16]. In terms of the development of interventions concerning injury prevention in sports, several development protocols can be used, including Intervention Mapping (IM) [17,18] and the Knowledge Transfer Scheme (KTS) [19]. The IM protocol describes the iterative path from problem identification to problem solving or mitigation. Each of the six steps of IM comprises several tasks, each of which integrates theory and evidence [17,18]. The KTS integrates existing implementation research frameworks into a tool which has been developed specifically to bridge the gap between knowledge derived from research on the one hand and evidence-based usable information and tools for practice on the other [19]. Both IM and KTS rely on consecutive steps and are closely related to each other. There are, however, key differences. For example, the KTS uses target users throughout the entire development process, whereas IM only uses them during the needs assessment stage [17][18][19]. IM focuses more on investigating behavioural change determinants and developing new strategies [17,18], whereas the aim of KTS is to translate evidence into practice [19].
The IM and KTS protocols act as a guide to developing interventions, but sometimes adjustments in the developmental process have to be made, for example due to practical issues. The aim of the current article is to provide insight into the systematic developmental process of two evidence-based interventions to stimulate injury-preventive behaviour in runners and skiers, in which IM and KTS are used as a developmental protocol (i.e. an overview of aspects to be covered in the development of an intervention). However, the final steps in the process are adjusted to meet the requirements of the intervention and the target group.

Development of the interventions
As stated above, both IM (six steps) and KTS (five steps) rely on consecutive steps and are closely related to each other. To develop two interventions to stimulate injurypreventive behaviour in runners and skiers, we combined steps from IM and KTS in a systematic four-step approach (see Fig. 1). The consecutive steps were based on two basic dimensions: 1) the close involvement of the target group (sport participants) and experts in the development of the intervention; and 2) the range of available methods for collecting relevant input and content for the development of the intervention, with separate research methods collecting information for different steps in the process. During desk research, expert meetings, survey and group interviews with the target group, information was simultaneously collected for problem statement, risk factors, intervention development, and the like.
Steps one to three are related to the problem exploration and the development of an intervention. Sports participants, sports experts, researchers and behaviour experts contributed throughout the developmental process. In step four, the effects of the intervention are evaluated in a randomized controlled trial.
Step 1: problem statement The starting point of the development of our interventions was a potentially effective, but time-consumingand therefore unattractive and complexintervention for injury prevention in running [13] and a problem statement for both sports identical to the first component of the problem statement in KTS. We used information on the number and severity of running-related and skiing-related injuries in the Netherlands, and calculations of financial costs of injuries, in an epidemiological analysis of the problem. Both the number and risk for RRIs in the Netherlands was high, while skiingrelated injuries were often severe [20].
Step 2: in-depth research As the number and the burden of injuries do not provide sufficient information to guide or start a development process, we undertook several research approaches to collect the required additional information. In this step, we strived to answer the following question: Which preventive measures or actions should be executed to prevent which running-related and skiing-related injuries by whom, and how should we do that?
We used four preferred research approaches among different target groups to answer this question: i) review of scientific literature to explore the most recent developments in injury prevention in running and skiing, and the mechanisms behind the effectiveness of these injury-preventive measures. Furthermore, information on existing interventions was collected. In March 2016, articles published in PubMed after the year 2000 were searched, using the following terms: injury*, prevent*, running, skiing, snowboard, effect*, intervent*, measure. Reviews, RCTs, and prospective studies were included. ii) expert meetings (one with running experts and one with skiing experts) were conducted in April 2016, to target high-risk groups and to prioritize injuries and injury preventive measures. During these 2-h sessions, the scientific literature on the incidence, prevalence, aetiology, risk factors and preventive measures of injuries was discussed, alongside strategies for injury prevention. Sport-specific experts were recruited by the Royal Dutch Running Association (KNAU) and the Dutch Skiing Association (NSkiV); they were able to claim financial compensation for their invested time. The running expert group consisted of a sports physician, a sports physiotherapist, two running coaches and a researcher in sports injuries. The skiing expert group consisted of three sports physiotherapists/skiers, two employees of the NSkiV and a researcher in sports injuries. Discussion leaders facilitated the expert meetings. Written reports of the meetings (topics, questions, answers and conclusions) were used as input information during the actual development of the intervention. No specific qualitative data analysis programme was used. iii) quantitative study among target populations (717 runners, 283 skiers): an anonymous one-time online survey was distributed among both target populations (running and skiing) in May 2016 and administered for 2 weeks. The respondents were recruited through social media accounts (Facebook, Twitter, LinkedIn) from the KNAU, the NSkiV, Runner's World magazine and the Dutch Consumer Safety Institute. Respondents who completed the questionnaire were entered into a draw in which they could win a 1-year subscription to Runner's World magazine (five subscriptions in total). The online survey was set up to explore whether the (qualitative) information collected through the expert meetings was largely supported by the actual target groups for prevention. Questions were formulated in relation to, among others: (i) RRIs and skiing injuries; (ii) current and future injuryprevention behaviour in running and skiing; (iii) determinants of injury-preventive behaviour; (iv) needs and support for the intervention; (v) characteristics (content, form) of the intervention; and (vi) effective strategies to implement the intervention. Descriptive statistics, in SPSS version 23, were used to analyse the data from the online survey. iv) focus group meetings with target populations were conducted in order to establish the best ways to approach runners and skiers for preventive actions. Two 2-h meetings were organized with runners, one meeting with four runners and one meeting with five. Focus group meetings (2 h per meeting) for skiing also consisted of four and five participants. The participants were recruited through the online questionnaire of the quantitative study. At the end of this questionnaire, respondents were asked whether they would like to participate in focus group meetings. Participants were randomly selected from a list of respondents willing to participate in further research. Focus group meetings were held in June/July 2016. All participants received a gift voucher to the value of €20. As with the expert meetings, the focus group sessions were facilitated by two discussion leaders. Written reports of the meetings (topics, questions, answers and conclusions) were used as input information during the actual development of the intervention. No specific qualitative data analysis programme was used.
As a result of this step two of in-depth research, consisting of different methods of data collection, a development plan for both interventions was established, containing information on the requirements of the interventions and an overview of the behaviour determinants to be tackled, and theories and strategies to be applied.
Main preferences and requirements for the interventions were: -A focus on a specific type or specific types of running or skiing injury was not desirable. -The two main general risk factors in running injuries to be tackled are: 1) the amount of stress or force a person can impose on the body (based on fitness, body weight, sports history, etc.) as evidence shows that training errors or training overload can lead to half of all injuries [21,22]; and 2) goalsetting behaviour of the athlete (e.g. running 5 km within 6 weeks, running a marathon; [Romeijn, Kemler, Huisstede; submitted]). In skiing, the general risk of sustaining a skiing injury was mainly a result of: 1) a skier's physical fitness (e.g. muscular strength, endurance, dealing with fatigue [15]); and 2) technical skiing ability [10]. -A few easily accessible and simple preventive measures should be proposed for injury prevention, in order to minimize the threshold for performing the target behaviour. -The intervention objective were to positively change injury-preventive behaviour in the following main target groups: 1) novice runners [4]; 2) novice skiers [10,11]; and 3) recreational (holiday) skiers [23]. -The main preventive measures proposed for runners were: using a training schedule that is appropriate for the physical condition of the athlete and represents a realistic running goal; doing strength exercises [24] to improve the amount of force that can be exerted on the body while running; and an active warm-up prior to running [25]. -Important preventive measures proposed for skiers were: performing strength exercises in the period prior to the skiing vacation to improve strength, physical fitness and endurance [26]; improving technical skills; using a skiing helmet [27][28][29][30][31]; increasing knowledge of ski slope regulations (the Fédération Internationale de Ski (FIS) regulations) [32].
-Finally, the interventions should be accessible by smartphone, tablet and PC.
Step 3: product development The interventions were developed in 11 months. The review of the literature started in April 2016. The final adjustments to the interventions, after the pre-test, were made in February 2017. The development of the interventions was supervised by a company specialised in behaviour change, experts in simplifying the choices people have to make, and offering easy steps for behavioural change by means of a creative, intuitive and visually attractive concept. Their vision and the development of the intervention was based on the Fogg Behaviour Model (FBM) to achieve behaviour change. The FBM model is mainly used in the field of persuasive technology. FBM views behaviour as a product of three factors: motivation, ability and triggers (Fig. 2) [33]. All three factors must ideally be present simultaneously to achieve the required behaviour change. In other words, high motivation, high ability, and triggers will optimize behaviour change. Based on this model, and on running and skiing experts, the content and form of the intervention were established. The main strategies were to: a) increase Motivation through developing a visually attractive web-based tool that stresses the positive effects of injury prevention on experiencing running and skiing activities, through a focus on the pleasure of performing sports without fearing injuries; b) increase Ability through the simplicity of the webbased tool (a few, easily accessible and easy-toperform preventive measures), and by tailoring the intervention towards specific subgroups and adjusting the preventive measures to the characteristics and ability of the subgroup.
Additionally, analogous to FBM, triggers have to be included in the intervention to persuade the athletes to actually perform the intended behaviour. Examples of triggers are videos, links to relevant websites, and graphics to stimulate the target behaviour.
The preferred methods and approaches for developing the interventions for runners and skiers were directly derived and translated from theoretical concepts in intervention development (Knowledge, Awareness and Self-efficacy). The results of this theoretical translation are presented in Table 1. The intervention for runners (Runfitcheck) is used as an example.
In addition to cooperating in the in-depth research steps of the process, the target groups of runners and skiers (i.e. the actual athletes) took part in the actual development of the interventions, alongside the research team, experts, and the company specialized in interventions to change behaviour. Co-creation sessions with the target population were held to discuss the first concepts of the interventions. Runners and skiers were invited to comment on content, visuals, and the design of the intervention. A 2-h meeting was organized with three runners, and a 2-h session was organized with three skiers. The participants were recruited from the focus group sessions. The main focus in these sessions was to link intervention and target group in order to maximize the possibility of athletes actually increasing injuryprevention behaviour.
The comments of the runners and skiers were used to fine-tune and optimize the interventions.
Then, a pre-test of the intervention was held after the interventions were optimized. To recruit the athletes, an email was sent to contact persons of the Dutch Consumer Safety Institute who were involved in running or skiing, and the participants of the quantitative studies. Those who were interested were given access to the interventions and filled in a questionnaire on how they experienced the intervention. Seventeen runners and 17 skiers provided their feedback. The interventions (named Runfitcheck and Wintersportklaar) were finalized using their feedback.
Since part of the starting point of the development of our interventions was a tailor made, potentially effective but lengthy and complexintervention for injury prevention in running [13], one of the goals was to develop an alternative intervention in which differentiation of target groups was a main objective. This approach was supported by the experts during the expert meetings, with a preference for basic, easy access to the intervention. As a result, a short questionnaire was proposed by the experts, as a simple means of distinguishing target groups for tailoring prevention, and this was developed by the company specialised in developing interventions to change behaviour together with researchers from the project group. This short questionnaire was evaluated several times by athletes during focus group sessions, Fig. 2 The Fogg Behaviour Model has three factors: motivation, ability, and triggers. Reprinted from [33] co-creation sessions and pre-testing, and adapted to athletes' preferred way of determining their own (subjective) fitness/experience/vulnerability/motivation. Runners fill in four questions on their "fitness" and two on their "goal-setting behaviour". Skiers answer three questions on their physical fitness and three questions on their technical ability. Based on the answers, athletes are allocated to one of four basic quadrants, for example "low fitness/high ability" in skiing.
After completing the questionnaire, and subsequently being informed of the specific quadrant an athlete has Providing of and/or transfer of knowledge on the desired behaviour.
In the advice provided in the intervention, information on injurypreventive behaviour is transferred to runners.
Advance organizers (Kools et al., 2006) [35] Presenting an overview of the material that enables a learner to activate relevant schemas so that new material can be associated.
The advice on injury-preventive behaviour is presented in an accessible way with clear headings. Furthermore, runners can receive a personal schedule for running sessions and strength exercises each week (by email). The schedules are accompanied by instructions on how to carry out the strength exercises or running session.
Chunking (Smith, 2008) [36] Using stimulus patters that may be made up of parts but that one perceives as a whole.
The name of the intervention for runners is Runfitcheck, which refers to the necessity for the runners to prepare themselves for a running session and to verify their physical fitness prior to the running session. The name of the intervention reminds the runners that it is important to pay attention to their physical fitness when they go for a run.

Awareness
To be aware that the execution of injurypreventive behaviour is important to prevent RRIs.
Consciousness raising (Prochaska et al., 2008) [37] Providing information, feedback or confrontation about the causes, consequences and alternatives for a problem or a problem behaviour.
The intervention informs the runners about their risk for RRIs. For example, it is stated that novice runners do have a higher risk than more experienced runners Also, runners gain insight into the amount of stress or force they can put on their body, and goal-setting behaviour.
Knowledge transfer (Schaalma et al., 2001) [34] Providing of and/or transfer of knowledge on the desired behaviour.
The transfer of information on injurypreventive behaviour increases the runners' awareness of that injurypreventive behaviour.

Self-Efficacy
To feel able to execute injurypreventive behaviour. Prompting individuals to rehearse and repeat the behaviour various times, discuss the experience, and provide feedback.
In the intervention, runners are stimulated to execute injury-preventive behaviour by clear instruction in the advices, and instruction videos guided by voice over These instruction videos are also available in the personal schedules for running sessions and strength exercises which runners can receive each week (by email).
In the intervention, several ordinary athletes execute the desired injurypreventive behaviours. These athletes give a good example, e.g. they perform warm-up routines or strength exercises.
Tailoring (Lustria et al., 2009) [41] Matching the intervention or components to previously measured characteristics of the participants.
In the intervention, the advice given is based on a runner's physical fitness (the amount of stress or force the runner can impose on his body) and goal-setting behaviour, which are assessed at the start of the intervention.
been allocated to, the athletes receive a range of advice on injury prevention. The experts in the project team provided the actual preventive measures for the intervention. Measures were differentiated for different quadrants, i.e. tailored towards different subgroups of the target group. Runners and skiers in different quadrants received different running schemes, schedules for strength exercises, technique tips, and the like. Participants were additionally provided with the opportunity to subscribe to even more personalized training advice via weekly emails, based on the number of weeks preparation before a running event or skiing vacation.

Discussion
Using a three-step processan abbreviation or moderation of the various steps from Intervention Mapping and Knowledge Transfer Scheme protocolswe developed two interventions to stimulate injury-preventive behaviour in runners and skiers. Sports participants, sports experts and behaviour change experts contributed throughout steps two and three of the developmental process.
Our methodology to develop the interventions was guided by IM and KTS. As mentioned by Pas et al. (2018) [42], (strictly) following a protocol might pose some problems as, in this case, sports-specific practices might differ for different types of sports. It is important to use a protocol to guide your process, and to keep track of the important steps to be taken. It is equally important, however, to keep your specific population and situation in mind too. We started our developmental process with a problem statement. The next step was an in-depth research. Our step of in-depth research is extensive, and closely related to steps one to three from the KTS and steps one and two of IM. The expert meeting is comparable to the Knowledge Transfer Group in KTS. The experts were all runners or skiers and coaches or physiotherapists, and we discussed the problem statement, scientific evidence and the development of the required intervention with them. Furthermore, we asked them to verify the scientific evidence against the current situation in their type of sport. For example, according to the evidence for skiing, the use of a winter sport helmet should be stimulated. However, today it is normal for Dutch inhabitants to wear winter sports helmets while skiing. Although it is still important to mention the use of a winter sport helmet, stimulating this injurypreventive measure should not be the main focus of our injury-preventive intervention.
Sports participants were given an important role in this developmental process. From our developmental experiences in the past with regard to injury-preventive interventions, we know that if participants cannot relate to the intervention due to the content, its form or even tone of voice, they will not execute the intervention. Therefore, we did not only consult them in step one of IM/KTS (problem statement/needs assessment), but we also used the online questionnaire to explore whether, amongst other things, the (qualitative) information collected through the expert meetings was largely supported by the sports participants. Furthermore, we collected information on their current and future injuryprevention behaviour in running and in skiing, their needs and support for an intervention, and the characteristics and deliver strategies of such an intervention.
With the use of KTS and IM, we designed our own developmental process. Donaldson et al. (2016) published a systematic but pragmatic and iterative intervention development process as well [16]. Their six-step intervention development process involves: (1) compiling research evidence, clinical experience, and knowledge of the implementation context; (2) consulting with experts; (3) engaging with end users; (4) testing the intervention; (5) using theory; and (6) obtaining feedback from early implementers. All these steps are integrated into our three-step process too. Both the processes described underline the idea that research evidence alone is not enough to develop implementable interventions or to change behaviour, and evidence-based practice integrates the best available scientific evidence with practitioner and end user values. The development of an intervention in co-creation with experts and end users clarifies the need for tailor-made interventions. A "onesize-fits-all" intervention will not fulfil the needs of different groups of end users. Hence it is necessary to focus on specific target groups to enhance the usability of an intervention.
In step four of our model, the intervention is evaluated. Both IM and KTS recommend an evaluation of the developed intervention. In IM, after the programme production, a programme implementation plan has to be developed (step five of IM). Finally, in step six an evaluation plan has to be developed. Following the implementation of the intervention, the evaluation will take place. In KTS, step five consists of an evaluation according to the RE-AIM (Reach, Effectiveness, adoption, Implementation, Maintenance) framework [43]. After the development of the interventions, we choose to evaluate the effects of the interventions in a randomized controlled trial. If the interventions are effective in stimulating injury-preventive behaviour, an implementation and evaluation plan for each intervention will be developed (Steps five and six of IM), followed by a large-scale implementation of the interventions (and an evaluation of these implementations).
According to the IM procedures, tailoring the intervention towards specific subgroups of the target population increases the effectiveness of preventive advice to these specific subgroups [17,18]. In the case of these two interventions, the initial tailoring is restricted to a basic division of the athletes into four quadrants, based on a few questions. Arguably, this can be evaluated as being too simplistic to actually distinguish between target groups. However, because it was a goal of the project to include as many runners and skiers in the group of users, the threshold for participating was kept as low as possible, and an initial questionnaire should not be so comprehensive that athletes drop out before any preventive advice can be offered. In the same way, the preventive advice is not too complex or time-consuming, with only three or four basic options. The rationale behind this choice is that if many athletes use a few simple preventive measures, the effect on total preventive behaviour in a population will possibly be much higher than if only a few athletes perform complex, time-consuming injury-prevention strategies. However, the option to subscribe to personalized training schedules and exercises enhances the intervention, thereby also making it a useful tool for athletes who are willing to invest a little more time and effort in injury prevention. This option provides easily accessible and easy-to-perform actions as well. Arguably, the effort of reducing the threshold for participating in this preventive behaviour through a short questionnaireand thus maximizing compliance might result in a less strict division of subgroups than would ideally be the case. It should be added, however, that athletes who use the intervention are provided with the opportunity to change their assigned quadrant if they feel that they have not been allocated to the right quadrant on the basis of the short questionnaire. Ultimately, an effect study should establish whether this basic tailored advice is sufficient to increase preventive behaviour.
During the expert sessions, it was indicated that a focus on a specific type of running or skiing injury was not desirable. This was supported by the review of the literature conducted. While there was no reason to focus attention on specific types of injury, there was evidence for specific risk factors for sustaining a running or skiing injury. The decision not to focus on specific injury types has also been made in the perspective of maximizing compliance: the simplicity of the intervention was a main objective. The most important factors governing injury-free skiing (fitness, ability, regulations) mainly prevent falls and collisionsinjury mechanisms that result in a wide variety of injury types. The most important measures in running (fitness, strength, warm-up) prevent many overuse injuries, irrespective of the specific body type involved. The exception was the recommendation of wearing a helmet while skiing, an evidence-based measure to prevent serious brain damage. Although thoughtful deliberation between the experts took place to balance inclusiveness versus simplicity in this intervention, there may be other relevant injury mechanisms in both sports which are currently underrepresented in this intervention. However, in the experts' opinion, a focus on fitness and ability (and subsequently on exercises and technique training) would have a bigger impact on a broad range of injuries than a focus on specific types of injuries.
A major challenge in the development of the intervention has been the focus on injury-preventive behaviour as an outcome in the study, instead of the more traditional measurement of injuries. It is well-known that people find it difficult to change health-related behaviour. It is a lengthy process and requires small steps [44]. This intervention was based on the FBM. It is expected that the model's focus on attractiveness and simplicity to increase motivation and ability, and the addition of triggers to help the athlete to actually perform the desired behaviour, will facilitate behavioural change. A study on the effect of the intervention is needed to establish the magnitude of this change.
It has been stated earlier that running and skiing were selected to assist in developing an injury-prevention tool because of their unorganized nature of participation. This means that there are no intermediate target groups, like coaches or trainers, that help increase the athletes' compliance to preventive measures. Therefore, a focus on increasing compliance is key, and simplicity and attractiveness of the web-based tool are of utmost importance.
According to Van Mechelen's 'sequence of prevention' model, the development of the online injury-prevention tools for running or skiing should be followed by an evaluation of its effectiveness [45]. Consequently, two prospective controlled trials have been started in the Netherlands in order to establish whether the interventions lead to an increase in injury-preventive behaviour among runners and skiers. In the case of empirical evidence for its effectiveness on behaviour, the implementation of the online interventions will be initiated. In that case, a study that establishes the intervention's effect on actual running and skiing injuries should be conducted.

Conclusions
This article describes a "real-life" example of the development of an intervention. It describes required steps in the development, gives insight into the methods used and the lengthy, time-consuming development process. Based on IM and KTS protocols, two interventions to stimulate injury-preventive behaviour among runners, skiers and snowboarders have now been developed. However, we believe that it is necessary to involve end users as soon and as much as possible to develop an intervention that fits the needs of the target population, and that will be used by them. Several steps in the IM and KTS protocols have thus been adjusted in order to establish a maximum fit between intervention and target group, and to maximally increase behavioural compliance to injury-preventive measures. Intervention development might benefit from a more loosely structured step-by-step model, in which preferred research methods are leading in collecting required information, which is then used in the further development of an intervention.