10. Quality Requirements

10.1 Quality Tree

Note: The (1), (2), (3) in the following table repeat the top level quality requirements from chapter 1.2.

Quality Category	Quality	Description	Scenario
Usability	Ease of Use (3)	Ease of use by the policeman, especially in the use case of pursuing another car
	Ease of Learning	The standard functions should be as easy and intuitive to use as possible without the need for lengthy prior instruction	SC1
Performance	Accuracy (1)	Measurements and calculations shall be correct and precise within the specified deviation range
	Comprehensiveness	The algorithms used must be as legally watertight as possible and comprehensible
	Precision & Accuracy	If possible, the video insertions should be made with the granularity of a video frame
	Robustness (2)	The system shall work reliable under all specified environment and operating conditions.
Operational & Environmental	Temperature Range	The temperature range in which the correct functioning of the device is ensured should range from -25 degrees to +85 degrees	SC3
Maintainability & Support	Maintenance & Repair	It should be possible to replace components outside the measurement box without affecting the correct measurement inside the measurement box
Security	Integrity	Verifiability of the authenticity of the video files shall be ensured with a verification code
Cultural and Regional	Multilanguage	the texts of the user interface should be able to be converted by a translation file into different languages with ASCII character set	SC4
	Local Time Adaptability	The time difference to Greenwich must be adjustable with a granularity of 1 minute
	Local Legal Rules Adaptability	the measurement procedure shall be adaptable to regional legislation
Legal	Legal Compliance	Correct implementation and application of all legal requirements in the evaluation for the different types of pursuits	SC2

10.2 Quality Scenarios

Id	Scenario
SC1	A user who does not know the system can operate it after 10 minutes of instruction
SC2	When playing a video frame by frame afterwards, each frame contains exactly the expected information
SC3	Even under maximum and minimum temperature (e.g. in a climatic chamber), the device always outputs the same speed at constant pulse frequency.
SC4	With appropriate translation files replacing the default language (English), all displayed and printed texts now appear in this language.