Final answer:
To express the requirements quantitatively, specific measurable values or metrics need to be assigned to each requirement. For example, user satisfaction surveys or usability tests can be conducted to measure the ease of use, system uptime can be measured for reliability, and response time can be measured for the rapid response requirement.
Step-by-step explanation:
To express the requirements quantitatively, we need to assign specific measurable values or metrics to the requirements. Let's examine each requirement:
a. The library system shall be easy-to-use.
This requirement can be quantitatively expressed by conducting user satisfaction surveys or usability tests to measure the ease of use on a scale (e.g., 1-5) or by measuring the time it takes for users to complete certain tasks in the system.
b. The library system shall provide reliable service to all classes of user.
This requirement can be quantitatively expressed by measuring the system uptime or reliability metrics like mean time between failures (MTBF) or mean time to repair (MTTR).
c. The library system shall provide a rapid response to all user requests for book information.
This requirement can be quantitatively expressed by measuring the response time of the system, i.e., the time it takes to provide book information after receiving a user request.