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my_digital_garden/4a1s/RAS/PL - Aula 3.md

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4 de Outubro 2023 - #RAS

[!help]+ Ex. 7.1 The use of a natural language (for instance, English or Spanish) and intuitive diagrams is used for documenting user requirements. What is the main reason?

  1. To eliminate the communication difficulties among the stakeholders.
  2. To facilitate understanding
  3. To have no ambiguities
  4. To be precise

[!hint]- Resolution Option 2 is the correct one.

[!help]+ Ex. 7.2 Which of the following sentences does not constitute a valid system requirement?

  1. The product shall be developed using an agile method.
  2. The product shall respond to all requests in less than 5s
  3. The product shall be composed of 12 modules.
  4. The product shall use always menu screens to communicate with the users.

[!hint]- Resolution Option 1 does not constitute a valid system requirement.

[!help] Ex 7.5 The following are requirements of a controller of a swimming pool: R1: The input valves should be open when the swimming pool is filling. R2: The input valves stop when the level of the water reaches 2 m. R3: The level of the water should increase gradually. R4: The output valves must be open when the water is higher than 2.1 m. Which defects this set of requirements present?

  1. ambiguous
  2. solution-dependent
  3. incomplete
  4. not verifiable

[!hint]- Resolution Option 1 is the correct one.

[!help] Ex. 7.6 Analyse the following user requirements and indicate if they are clear and verifiable. If not, reformulate the wording.

  1. The communication system can only "crash", at most, once a month.
  2. The system shall be easy to learn by students with minimal training.
  3. The average delay for the users of a system to pay tolls shall be less than 15s.
  4. All users shall use the same mobile application.
  5. The maximum delay between the submission of a questionnaire and its confirmation must be half an hour.
  6. The operator shall be able to communicate by mobile phone with the bus driver.

[!hint]- Resolution

  1. The communication system shall be available 95% of the time.
  2. Users of the type students with 20h of training shall correctly use 80% of the system features.
  3. precise and verifiable, but the using 'average' is not a good measurement -> The maximum delay for the users of a system to pay tolls shall be less than 15s.
  4. depends on the context
  5. precise and verifiable