Shift models define how working hours are distributed across different time slots and employees – from the simple day/evening shift to fully continuous 24/7 operations. They enable the economically efficient use of machinery and capacity, but must comply with the legal requirements of the German Working Hours Act (Arbeitszeitgesetz, ArbZG) as well as the co-determination rights of the works council. For HR professionals, choosing the right model is critical for employee satisfaction, health protection, and legal compliance.
What Are Shift Models?
A shift model describes the systematic division of operating hours into multiple consecutive working time blocks – known as shifts – covered by different groups of employees. The goal is to maintain operational output beyond the regular working hours of any individual employee.
In Germany, shift work affects around 20 percent of all employees and is particularly prevalent in manufacturing, healthcare, logistics, hospitality, and the security sector. Unlike flexitime or hybrid working, shift work follows a fixed, pre-defined schedule – the so-called shift plan.
A shift model determines: How many shifts are there per day? What hours do they cover? How do employees rotate between shifts? And when do rest days occur?
Overview: The Most Common Shift Models
The common shift models differ primarily in how many hours per day and how many days per week operations run.
2-Shift Model (Day and Evening Shift)
The 2-shift model is the simplest model and typically covers operating hours from around 6:00 a.m. to 10:00 p.m. Day shift and evening shift alternate. There is no night work, and operations are closed on weekends. This model is particularly suitable for trades, administration, or light manufacturing, and places the least strain on employees' health.
3-Shift Model
The 3-shift model extends operations to 24 hours on weekdays by adding a night shift. It typically covers Monday to Friday or Monday to Saturday. Since night work carries particular health risks (see "Health Effects" section), special protective regulations under § 6 ArbZG apply to night shift workers.
Fully Continuous Shift Model (24/7)
The fully continuous shift model means: operations run 24 hours a day, 7 days a week – including Sundays and public holidays. This is typical of power plants, the chemical industry, hospitals, and emergency services. To distribute working hours fairly across all shift groups, four or more rotating shift teams are commonly used. Due to Sunday and public holiday work, particularly strict regulations under the ArbZG apply.
Discontinuous Shift Model
In the discontinuous shift model, operations run in multi-shift mode on weekdays but pause at weekends. It can be operated as a 2-shift or 3-shift variant. The semi-continuous model represents an intermediate option: operations run Monday to Saturday, with Sunday off.
Rotating Shifts and Further Variants
With rotating shifts, employees regularly move between different shifts – for example, one week of day shifts, then evening shifts, then night shifts. The direction of rotation matters for health: a forward rotation (days → evenings → nights) is considered ergonomically preferable to a backward rotation, as it better aligns with the body's natural circadian rhythm. Additionally, 4-shift models exist that allow more rest days per employee in 24/7 operations.
Legal Framework: What the Working Hours Act Requires
Maximum Working Hours and Rest Periods (§§ 3, 5 ArbZG)
The Working Hours Act (ArbZG) provides the legal framework for all shift models in Germany. The key regulations:
According to § 3 ArbZG, daily working time must not exceed eight hours. An extension to up to ten hours is permissible, provided that the average working time over a period of six calendar months or 24 weeks does not exceed eight hours per working day.
§ 5 ArbZG requires an uninterrupted rest period of at least eleven hours between two shifts. This means: an employee finishing work at 10:00 p.m. may not return to work until 9:00 a.m. the following day at the earliest.
Special Regulations for Night Work (§ 6 ArbZG)
Under the ArbZG, night work is defined as work performed for more than two hours during the night period (11:00 p.m. to 6:00 a.m.). The following applies to night workers:
- Working time is limited to a maximum of eight hours per night.
- Extension to ten hours is possible if compensatory time off is provided within four weeks.
- Night workers are entitled to appropriate compensation under § 6 Para. 5 ArbZG – either as additional days off or as a shift supplement. There is no statutory entitlement to a specific supplement amount; this is determined by collective agreement, works agreement, or employment contract.
- Night workers are entitled to occupational health examinations.
Deviating arrangements may be agreed upon through collective agreements (§ 7 ArbZG), which is common practice in many sectors.
Co-Determination by the Works Council (§ 87 BetrVG)
The introduction or modification of shift models is subject to co-determination. Under § 87 Para. 1 No. 2 of the Works Constitution Act (BetrVG), the works council has a binding right of co-determination regarding the start and end of daily working hours and the distribution of working hours across weekdays. If no agreement is reached with the works council, a conciliation committee may be convened. HR professionals should therefore involve the works council early in the planning process.
Health Effects of Shift Work
Risks: What Does the Research Say?
Shift work – particularly night work – demonstrably affects health in the workplace. The circadian rhythm (the body's natural 24-hour sleep-wake cycle) is disrupted by night work, which can lead to sleep disorders, reduced concentration, and in the long term an increased risk of cardiovascular disease. The Federal Institute for Occupational Safety and Health (BAuA) has highlighted these connections in numerous publications. Social strain adds to this burden: shift workers are often available at different times than their families and friends, which can lead to social isolation.
Ergonomic Shift Planning: How to Minimise the Strain
The German Social Accident Insurance (DGUV) recommends specific measures to reduce the burden in its guidelines on shift plan design:
- Choose forward rotation (days → evenings → nights), not backward
- Plan short night shift blocks (a maximum of two to three consecutive nights)
- Allow sufficient rest days after night shift blocks (at least two)
- Keep night shifts as short as possible (eight hours, no extension to ten)
- Take employee preferences into account wherever operationally feasible
Ergonomic shift planning is not mere welfare provision – it also pays off economically: fewer sick days, lower staff turnover, and higher productivity are measurable effects of a well-designed shift schedule.
Choosing the Right Shift Model: Tips for HR Professionals
The choice of shift model depends on several factors. A structured decision-making process helps to account for compliance risks and employee satisfaction from the outset:
Clarify operational requirements: How many hours per day and how many days per week does the operation actually need to run? Often, a 2-shift model can cover more ground than initially thought – without the strains of a fully continuous model.
Review sector-specific collective agreements: Many industries have special provisions in their collective agreements that may deviate from the statutory minimum standards of the ArbZG – in either direction.
Involve the works council early: The co-determination obligation under § 87 BetrVG is not an obstacle, but an opportunity for more practical solutions.
Build in health protection from the start: Ergonomic shift planning in line with DGUV recommendations should not be an afterthought, but considered from the outset when selecting a model.
Survey shift preferences: Employees who can contribute their shift preferences show higher satisfaction and lower absenteeism – where operationally feasible.
Frequently Asked Questions About Shift Models
What shift models are there?
The common shift models are: the 2-shift model (days and evenings, no nights), the 3-shift model (days, evenings, nights on weekdays), the fully continuous shift model (24/7 including Sundays and public holidays), the discontinuous shift model (24h on weekdays, weekends off), as well as rotating shift and 4-shift variants. The choice depends on operational requirements and industry.
What does the Working Hours Act say about shift work?
The ArbZG limits daily working time to eight hours (§ 3), extendable to ten hours with compensatory time off within six months. A minimum of eleven hours' rest between two shifts is mandatory (§ 5). Special protective regulations apply to night work (§ 6), including an entitlement to compensation in the form of time off or a supplement.
What is the difference between continuous and discontinuous operations?
In the fully continuous shift model, operations run 24 hours a day, seven days a week – including Sundays and public holidays. In the discontinuous model, operations pause at weekends. The semi-continuous model is an intermediate option: operations run Monday to Saturday, Sunday off.
Does the works council have a say in shift models?
Yes. Under § 87 Para. 1 No. 2 BetrVG, the works council has a binding right of co-determination regarding the start and end of daily working hours and their distribution across weekdays. The introduction or modification of a shift model therefore requires a works agreement. If no agreement is reached, a conciliation committee may be convened.
What health risks does shift work carry?
Shift work, particularly night work, disrupts the body's circadian rhythm. Possible consequences include sleep disorders, an increased risk of cardiovascular disease, and psychological strain due to social isolation. The BAuA recommends ergonomic shift planning to minimise these risks.
What is ergonomic shift planning?
Ergonomic shift planning designs shift schedules according to scientific criteria to reduce health burdens. Core principles per the DGUV guidelines: forward rotation (days → evenings → nights), short night shift blocks (max. 2–3 nights), sufficient rest days after night shifts, and night shifts kept as short as possible.
Is there a statutory entitlement to a shift supplement?
The Working Hours Act itself does not specify a particular supplement amount. However, it does oblige employers to provide night workers with appropriate compensation – either as paid time off or as a monetary payment (§ 6 Para. 5 ArbZG). The specific amount is determined by the collective agreement, a works agreement, or the employment contract.
Which shift model is the most health-friendly?
As a general rule: the less night work, the lower the health burden. The 2-shift model without night shifts is the least strenuous. Where night work is unavoidable, the BAuA recommends forward rotation and keeping consecutive night blocks as short as possible.
Conclusion
Shift models are an indispensable organisational tool for companies that need to operate beyond regular daytime hours. Choosing the right model requires careful consideration of operational requirements, the legal provisions of the ArbZG, and the health protection interests of employees. Those who factor in ergonomics, co-determination, and compliance from the outset will save costs in the long run through fewer sick days and lower staff turnover.
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Sources
- Working Hours Act (ArbZG), esp. §§ 3, 5, 6, 7. Federal Ministry of Justice, 1994 (last amended 2020). https://www.gesetze-im-internet.de/arbzg/
- Works Constitution Act (BetrVG), § 87 Para. 1 No. 2. Federal Ministry of Justice, 1972. https://www.gesetze-im-internet.de/betrvg/
- Night and Shift Work: Recommendations for Occupational Physicians and Safety Specialists (A45). Federal Institute for Occupational Safety and Health (BAuA), 2020. https://www.baua.de/DE/Angebote/Publikationen/Praxis/A45.html
- Guidelines on Shift Plan Design. German Social Accident Insurance (DGUV), 2012. https://publikationen.dguv.de/regelwerk/informationen/1393/schichtplangestaltung
- Shift Work in Germany – Prevalence and Working Conditions. Institute for Employment Research (IAB), 2022. https://www.iab.de
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