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Occupational demands of educators are not very well researched. Nevertheless their work is subject to several requirements. Whether these demands have an effect on the work ability and the health status of employees has also not been examined. Furthermore it is unclear if the ownership type of day care centres have an influence on job satisfaction and work ability of the pedagogical staff and what kind of resources do exist. Previous studies were mainly based on questionnaire data. Objective data does not exist. Therefore the aim of this investigation is to collect precise data relating to work of educators.
Effects of different types of ownership of day care centres on job satisfaction and work ability of educators will be assessed with the help of objective real time studies in combination with multi-level psycho diagnostic measurements.
The present study is the first of its kind. Up to now there are no computer-based real time studies on workflow of pedagogical staff with regard to assess their work-related stress. Following an exhaustive documentation of educators work processes the day-to-day task can be estimated and approaches for prevention can be developed. This can substantially contribute to an overall improvement of child care in Germany.
Working conditions of educators have not been scrutinized thoroughly in scientific research. Only a few studies have so far examined workload and strain in this profession. It is subject to several psychosocial requirements . These are to a lesser extent special severe burdens but rather an interaction of minor strains which sum up in their negative effect . Among them are disadvantageous postures caused by inappropriate sized furniture, overexertion of the voice and noise, which might exceeds work safety requirements[3-5].
Today in an increasingly heterogeneous society educators find themselves regularly acting between the conflicting priorities of their standards and the family's socio cultural believes. Additionally documentation and administrative tasks accumulate increasingly in recent years . The spatial and material conditions and the division of labour within the organization, the possibilities of participation may also play a role in the degree of perceived stress. An intensive focus on recipients and clients as typical for educational profession can lead to high workload, if organizational framework impedes relationship building . Educators complain about: size of the group , unfavourable respectively long working hours and difficulties in contact with parents. Sixty per cent of educators in a survey judged shortage of staff to be a strain . Half of them perceive time pressure and multitasking as stressful - especially managers of day care centres [5,9]. Ninety-two per cent of respondents report on to many tasks whereas they do not feel enough equipped for it . One in five complain about interruptions  which could lead to deterioration of educational tasks.
Communication and participation are resources of the work in kindergartens . Studies showed a close connection between perceived occupational competence and strains resulting from conflicts with parents . Furthermore possibilities of a personal work style and work with children are sources of energy and motivation.
The health situation of educators differs from average values of the labour force of Germany. Educators possess more sick days in overall comparison to other staff in public service. Forty per cent of these sick days are caused by musculoskeletal disorders . Mental and psycho-somatic disorders also appear more frequently than in the average population . The most frequent complaints include: shoulder and neck pain, sacroiliac or back pain, musing, languor, and uneasiness . As a consequence of job conditions educators are also susceptible to develop job burnout [3,5]. These occupational demands may as well have an influence on educators' work ability.
Ilmarinen and Tempel define work ability as the sum of factors enabling an employed person in a certain situation to manage his or her working demands successfully . That means work ability is a dynamic process following an interaction of working conditions, individual characteristics and society [15,16]. The preservation of work ability is not only a consequence of health and functional capacity, but also a result of work demand and organization . Research have shown, that for educators in general aspects of work like lack of support, bureaucracy, time pressure and workload have negative effects on health [18-20].
The effects of work-related and personal risks and resources on educators' work ability in day care centres have not been well researched. Moreover it is unclear if the ownership type of the day care centres have an influence on job satisfaction and work ability of employees. Available studies on workload and strain in this profession were based on questionnaires and statements of educators. Objective data is not available [5,6]. Nevertheless a probable divergence can be expected between findings from of objective and subjective observation.
Job task analyses are used to quantify work flow. Aim is to document demands of a specific job. The analysis can form a base for future job improvements .
This approach is defined by examining the tasks and sequences of tasks necessary to perform the job within a defined period of time. Usually a stopwatch, pencil and protocol sheet was used . But this method is time consuming and imprecise . These problems can be reduced by a computer-based recording methodology. It enables the collection of different tasks truthfully to the nearest second [24-29]. Mache et al. recently developed a job task analysis instrument for monitoring physicians' job tasks in different medical settings. Analyses revealed methodology's validity and reliability for evaluating physicians' working routines as well as organizational context factors . This job task analysis instrument can be extended to other professions  and will be used for the present study. The software and the task categories will be adapted for the present research question. This adjustment includes:
• Generation of a set of categories for educators' task analysis
• Definition of body postures assumed during work time
Many educators complain about physical strain caused by their work [8,10,30]. Due to the fact that it is unknown how time an educator has to spent in different body positions, recording of different body positions and movements will be part of the intended monitoring.
The main objective of this investigation is to collect precise time data of educators' work task.
With the help of the intended study accurate job task profiles ought to be defined with a view on different kind of ownership. Multi-level diagnostic measurement is used to identify possible sources of stress i.e. educators' work load and occupational demands. It is a long-term goal to develop approaches for prevention based on the results of the study. Therefore an identification of ranges of stress is needful.
To achieve this goal bidirectional assessment is applied. It permits evaluation of workload objectively independent of educators' point of view. In addition the subjective perception of working conditions will be captured. This makes it possible to assess aspects of work and personal as well as organisational resources which may have an influence on educators' work ability and job satisfaction.
Within the framework of the investigation a set of questions will be answered.
1. What kind of occupational demands exist for educators in day care centres?
2. Does the type of ownership have an influence on educators' working conditions (e.g. occupational demands, state of health) and job satisfaction?
3. What kinds of resources exist in this profession?
4. Are there differences in workload with regard to different types of ownership?
5. Do different kinds of organisation models have an effect on work flow?
6. What factors have an impact on educators' job satisfaction?
7. What kind of occupational resources have an influence on work ability of employees?
Educators caring for children of different age groups (0-6 years) will be included in the study. Furthermore, they will be recruited from day care centres of different ownership types (private, municipal, confessional, voluntary welfare, non profit organizations, and parents' initiative) (Fig. (Fig.11).
After contacting management of day care centres by the research group, educators are in invited to participate in the study on a voluntary basis. The comparative samples are composed of educators working at day care centres of different ownership. In so doing a satisfying comparability of the groups will be achieved.
Objective task analysis is based on data of educators' work in day care centres. These data forms the basis for load analyses. In so doing a differentiation can be made between subjects with very stressful or less stressful jobs. This discrimination can be performed most precisely via objective task analyses.
With the aid of the developed activity acquisition program sequence of work can be recorded by mobile computer-based collection equipment (Ultra Mobile PC) (Fig.(Fig.22).
This activity acquisition program is based on tasks what educators perform in their daily work routine. First step to obtain this taxonomy is a literature review on job tasks. In a second step interviews with conversant specialists in these areas have to be conducted. The taxonomy makes objective work flow documentation possible. Additionally physical strain will be registered by recording body posture employees assume during their work time.
The Ultra Mobile PC can operated singlehanded and permits the exact time registration by touching the screen. After monitoring, data will be analysed statistically and graphically: the number of individual occurrences of each task, mean duration of each occurrence, the total time (in seconds) spent on each task, task category, and the time expenditure for all tasks will be counted.
Significant differences will be detected with a sample of at least 15 educators of day care centres of different type of ownership. They will be observed during three workdays. In doing so every weekday should be evenly distributed so much that a comparison of educational tasks is achievable for all weekdays.
Subsequently the collected data will be interpreted and used as reference values for educators work.
During monitoring the following aspects should be documented:
• The kind of work activity
• Duration and frequency of the tasks
• Body postures assumed during work time
• Work environment (noise level, lighting, temperature)
• Interruptions (frequency, duration, type)
• Rest periods (time, duration, location)
The study design enables bidirectional assessment of objective and subjective perception of the work situation of educators. In so doing not only job demands will be measured but also personal resources which might have an influence on work ability, job satisfaction and the perception of stress. Moreover only job holders themselves can evaluate their working conditions and workload.
These job related factors at work will be measured with the German version of the Copenhagen psychosocial questionnaire (COPSOQ) . This instrument covers multiple aspects of work, for example:
• Demands (e.g. emotional demands, work - privacy conflict)
• Influence and development (e.g. meaning of work, workplace commitment)
• Interpersonal relations and leadership (e.g. feedback, social relations)
• Outcomes (e.g. job satisfaction, burnout)
Additionally the Work Ability Index (WAI)  will be used to assess how long educators are able to work and to what extent this ability depends on the work content and job demands.
The self-administered questionnaire will be provided to educators as paper-and-pencil form. Participants will be asked to fill in and post it in a box positioned in their workplace within two weeks.
Subject to the hypotheses different kinds of statistical analyses will be performed:
Basic statistics and ANOVAs (analysis of variance) will be calculated to analyse differences in work conditions as well as in job satisfaction and work ability between different ownership types.
Hierarchical regression analysis will be applied to analyse the degree to which work ability and job satisfaction of educators can be explicated by job demands and resources. In order to assess differences in the effects of job demands and resources between the day care centres, discrete analyses will be carried out for each type of day care centres ownership.
All tests will be applied two-tailed. P-values < .05 will be considered statistically significant throughout. Values will be given as mean and standard deviation. Data analysis will be performed using SPSS® software package for social sciences; Version 16.0.
As far as we know no computer-based real time studies do exist on work activity in day care centres in order to objectively evaluate an educator's work-related stress. Main objective is to identify sources of stress and to develop approaches for prevention based on the results of the study. It is a long-term goal to create a health-promoting work environment for educators. This may result an increased job satisfaction and work ability of educators. Altogether this study can substantially contribute to an overall improvement of child care in Germany.
The authors declare that they have no competing interests.
BK, SM and DAG conceived and designed the study. BK wrote the manuscript. BK, AN, MS, DQ, DAG, and SM contributed substantially to its final version. All authors read and approved the final manuscript.
This study was supported by the Institution for Statutory Accident Insurance in the Health and Welfare Services.