Requirements Formulation Catalog

This page serves as a reference for precise formulations in requirements engineering. You can use this page to copy the texts directly into your project. Click on the ID in the first column (e.g., #aut-01) to copy the direct link to this example to your clipboard.

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Automotive (Vehicle Engineering)

Example #	Stakeholder Requirement	System Requirement
#aut-01	Emergency Brake Display: The car shall automatically warn during emergency braking.	If a deceleration of > 7 m/s² is registered, the system must activate the hazard warning lights at a frequency of 3 Hz.
#aut-02	Fast Charging: Fast charging at DC stations for long-distance travel.	The BMS must be able to maintain a charging current of 200A at a cell voltage < 4.2V for at least 10 minutes.
#aut-03	Tire Pressure: The driver must be warned immediately in case of pressure loss.	The TPMS must detect a pressure drop of > 0.2 bar within 30 seconds and issue a CAN bus warning message (ID 0x4F2).
#aut-04	Lightweight Construction: The chassis must be weight-optimized for range optimization.	The total weight of the unsprung masses on the front axle must not exceed 45 kg (including brake system).
#aut-05	Corrosion Resistance: The bodywork must be protected against rust-through for 12 years.	All structural components must pass a salt spray test according to DIN EN ISO 9227 for 720 hours without signs of base metal corrosion.
#aut-06	Coating Thickness: The paint must be resistant to stone chips.	The E-coat (Electrophoretic Coating) must have a constant layer thickness of 20 µm ± 5 µm on all interior surfaces.
#aut-07	Environmental Compatibility: The vehicle must be recyclable at the end of its life cycle.	At least 85% of the vehicle weight must be recyclable according to ISO 22628; hazardous substances according to REACH are excluded.

Medical Technology

Example #	Stakeholder Requirement	System Requirement
#med-01	Overpressure Protection: Patient protection against mechanical overpressure.	The system must open a mechanical overpressure valve within 10ms if the pressure rises above 50 mbar.
#med-02	Alarm Signaling: Critical errors must be audible even during a power failure.	The acoustic warning unit must produce a sound pressure level of 80 dB(A) at 1m distance for at least 10 minutes during a power failure.
#med-03	Data Integrity: Patient data must not be deleted by operating errors.	Before executing the delete_record() function, a modal confirmation dialog with a password must appear.
#med-04	Pressure Difference: The controller must recognize from the pressure resistance whether the device is connected.	The pressure difference between connected and not connected must be at least 20 mbar.
#med-05	Residual Contamination: Implants must be delivered absolutely residue-free.	Residual contamination after final cleaning must not exceed a limit of 0.5 mg of total organic carbon (TOC) per component.
#med-06	Power Supply: The device must continue to run during internal transport.	The uninterruptible power supply (UPS) must guarantee full-load operation for at least 30 minutes without an external grid connection.
#med-07	Fire Resistance: The housing must not burn in case of a fault (oxygen enrichment).	All plastics used in the patient area must meet flammability class UL94-V0.
#med-08	Hardness: The surgical blade must remain sharp permanently.	The scalpel blade must have a hardness of at least 54 HRC (Rockwell) in the cutting area according to DIN EN ISO 6508-1.

Software & IT

Example #	Stakeholder Requirement	System Requirement
#soft-01	Data Export: Simple PDF export of project data.	The generate_pdf() function must provide a valid PDF/A document within 3 seconds.
#soft-02	API Performance: The interface must handle high loads.	The REST API must guarantee a latency of p95 < 200ms with 500 simultaneous GET requests.
#soft-04	Availability: The database must be available for worldwide shift operations.	The system must have an availability of 99.99% (High Availability), whereby planned maintenance windows must not exceed 4 hours per month.
#soft-05	Redundancy: A server failure must not lead to data loss.	Data storage must occur via a geographically redundant cluster system (Active-Active) allowing failover without session loss in < 1s.

Mechanical Engineering & Robotics

Example #	Stakeholder Requirement	System Requirement
#mech-01	Emergency Stop: The machine must stop immediately in case of danger.	Upon activation of the emergency stop switch (S1), the power supply to the drives must be interrupted within 150ms.
#mech-02	Ergonomics: The control panel must fit people of different sizes.	The HMI panel must be continuously adjustable in height between 900mm and 1300mm above the hall floor.
#mech-03	Vibration Damping: The machine must not vibrate the building.	The foundation must have active vibration isolators (damping degree > 0.8) that absorb 95% of frequencies above 10 Hz.
#mech-04	Material Wear: The guide rails must be low-maintenance.	The sliding pair must be designed for a mileage of 10,000 km at nominal load before linear wear exceeds 0.1 mm.
#mech-05	Geometric Tolerance: The shaft connection must run without backlash.	The fit between shaft and hub must be designed as an interference fit according to ISO tolerance zone H7/n6.
#mech-06	Weldability: The frame must be joinable at low cost.	Structural steel S235JR shall be used; weld preparation must allow automated MAG welding according to DIN EN ISO 5817 (Quality Level B).
#mech-07	Efficiency: The drive should waste as little energy as possible.	The overall efficiency of the geared motor (electrical to mechanical) must be at least 92% (IE4 class) in the nominal load range.
#mech-08	Mountability: The machine must be deliverable in standard containers.	The assemblies must be modularized so that no component exceeds transport dimensions of 2.3m x 2.3m x 5.8m.
#mech-09	Color Coding: Warning areas must be immediately recognizable.	Moving parts and pinch points must be permanently powder-coated in RAL 1021 (Rapeseed Yellow).