Traffic Pursuit Unit arc42 section 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 | |
| Usability | 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 | |
| Performance | Comprehensiveness | The algorithms used must be as legally watertight as possible and comprehensible | |
| Performance | Precision & Accuracy | If possible, the video insertions should be made with the granularity of a video frame | |
| Performance | 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 |
| Cultural and Regional | Local Time Adaptability | The time difference to Greenwich must be adjustable with a granularity of 1 minute | |
| Cultural and Regional | 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. |