Guidance for configuring advanced appointment scheduling for a vaccination center

  • Release version: Yokohama
  • Updated January 30, 2025
  • 5 minutes to read
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    Summary of Guidance for configuring advanced appointment scheduling for a vaccination center

    This guidance explains how to configure advanced appointment scheduling within ServiceNow for vaccination centers, focusing on setting appointment durations, daily schedules, holiday schedules, and capacity management. Proper configuration ensures accurate availability of appointment slots, preventing overbooking and appointment invalidation. It highlights the impact of changes on existing and future appointments, helping administrators avoid common pitfalls.

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    Key Configuration Areas and Recommendations

    • Vaccination Appointment Configuration:
      • Name and Description: Can be changed without side effects.
      • Holiday Schedule: Avoid adding or modifying holiday schedules when appointments exist, as this invalidates booked appointments.
      • Appointment Duration: Do not change if appointments already exist to prevent overlapping slots and overbooking.
      • Lead Time: Can be changed safely without affecting existing appointments.
      • Future Bookable Max Days: Increasing is safe; decreasing invalidates appointments booked on the last day.
      • Reschedule or Cancel Time: Change only if no workflows affect existing appointments.
      • Active Status: Avoid deactivating configurations with existing appointments to prevent invalidation.
    • Vaccination Schedule:
      • Name: Safe to change.
      • Start Date: Do not increase if appointments exist between old and new dates; decreasing is allowed only if no schedule overlap occurs.
      • End Date: Do not decrease if appointments exist after the new end date; increasing is allowed only if no schedule overlap occurs.
      • Appointments Per Window: Do not set to zero or reduce when appointments exist; reducing causes overbooking due to capacity mismatch.
      • Daily Start and End Times: Avoid modifying start time after appointments are booked; increasing end time is allowed if other parameters remain unchanged; decreasing end time invalidates appointments and causes overbooking.
      • Bookable Days: Adding days is safe; removing days with existing appointments invalidates those appointments.
      • Include Daily Break: Do not change this setting or break duration once configured; avoid setting break times equal to daily start or end times to ensure slots generate correctly.

    Practical Implications

    By following these configuration recommendations, ServiceNow administrators can maintain the integrity of vaccination appointment schedules, accurately reflect location capacity, and avoid invalidation or overbooking issues. Careful change management is critical when modifying scheduling parameters, especially when appointments have already been booked.

    Advanced appointment scheduling configuration enables administrators to configure appointment durations, daily schedule, holiday schedule, and so on. The configuration is used to identify the available slots as well as a location’s capacity for a given day. The configuration enables users to select appointment slots based on the parameters that you configure.

    Be mindful that changing some of the configuration values for a finalized vaccination center configuration can have undesired side effects on both existing and future appointments.

    The following forms and tables provide some helpful guidance for handling advanced appointment scheduling configurations for a vaccination center. They also provide some of the impacts of making certain changes. However, this guidance doesn’t address an exhaustive list of all possible side effects.

    Figure 1. Vaccination Appointment Configuration form
    Vaccination Appointment Configuration form with various fields to fill. For information on the fields available on the form, see the Vaccination Appointment Configuration form section that follows.
    Table 1. Vaccination Appointment Configuration form

    Field

    Recommendation and Impact

    Name

    You can change the name field without causing undesired side effects.

    Description

    You can change the description field without causing undesired side effects.

    Holiday schedule

    Don’t add a new holiday schedule when there are existing appointments in the current location. It invalidates existing appointments. Don’t add more holidays to the existing holiday schedule. New holidays may already contain booked appointments.

    Appointment duration
    • Don’t modify the appointment duration when appointments have already been created in the current location.
    • Impact: Changing the total capacity of a location causes overlapping slots that result in overbooked appointments.
    • For example:
      1. In your old configuration, if the appointment window was 5 minutes, the daily schedule would have looked like: 9:00 to 9:05, 9:05 to 9:10, 9:10 to 9:15, and 9:15 to 9:20. In this configuration, you have appointments booked from 9:00 to 9:05 and from 9:05 to 9:10, and appointments available from 9:10 to 9:15 and from 9:15 to 9:20.
      2. If you create a new configuration with an appointment window of 10 minutes, then your daily schedule would look like: 9 to 9:10, 9:10 to 9:20 with available slots from 9:10 to 9:20, and actual slots are displayed in the same 10-minute increments.
      3. The configuration change causes an overbooking in the 9:00 to 9:10 slot, because it was booked for two appointments in the previous configuration.

    Lead time

    You can change the lead time value without impacting any existing appointments.

    Future bookable max days
    • Don’t decrease the value because appointments may have been booked on the last day in the current location. Decreasing the value invalidates appointments booked on the last day.
    • You can increase the value without impacting any existing appointments.

    Reschedule or cancel by time
    • You can conditionally change the value.
    • If there’s any workflow that impacts existing appointments or users, it isn’t safe to change the value.

    Active
    • Don’t deactivate the configuration when there are existing appointments. It invalidates existing appointments.
    • You can activate the previously inactive configuration without impacting any appointments.
    Figure 2. Vaccination Schedule form
    Vaccination Schedule form with various fields to fill. For information on the fields available here, see the Vaccination Appointment Configuration form section that follows.
    Table 2. Vaccination Schedule form

    Field

    Recommendation and Impact

    Name

    You can change the name field without causing undesired side effects.

    Start date
    • Don’t increase the value because appointments may be booked between the old start date and the new start date. Increasing the value invalidates appointments booked between the old start date and the new start date.
    • You can decrease the value only when there are no overlapped slots configured in the other schedule under the same appointment configuration.
    • For example:
      1. Say that your old schedule has a start date of April 8, 2021 and bookable days from Monday to Friday from 09:00 to 18:00.
      2. Suppose that you created another schedule under the same appointment configuration which has a start and end date of March 1, 2021 to March 31, 2021.
      3. Now, if you change the schedule start date to March 31, 2021, it creates an overlapped bookable slot with the existing schedule on March 31, 2021 and the system will create an error.

    End date
    • Don’t decrease the value because appointments may be booked between the new end date and the old end date. Increasing the value invalidates appointments booked between the new end date and the old end date.
    • You can increase the value only when there are no overlapped slots configured in the other schedule under the same appointment configuration.

    Appointments per window
    • Don’t set the number of appointments per window to 0.
    • Increase the number of appointments per window.
    • Don’t decrease the number of appointments per window for a service configuration when appointments have already been created.
    • Note the impact: Reducing the total number of appointments per window results in overbooked appointments per slot for the appointments that were created before the change.
    • For example:
      1. Old configuration: You had 4 appointments per window. If the total number of windows = 2, then your total capacity is 2*4, or 8. If you had 4 appointments created per slot, the total capacity used is 4*2, or 8.
      2. New configuration: You have 2 appointments per window. If you have two total windows, then your new total capacity is 2*2, or 4. But if you had 4 appointments already created per slot (based on a past configuration), then your total capacity is 4*2, or 8.
      3. With this configuration, the total capacity, 8, exceeds the new total capacity of 4, causing overbooked appointments.

    Daily start time

    Don’t modify the daily start time when appointments are already present. Modification creates overbooked slots and invalidates previous appointments.

    Daily end time
    • You can increase the daily end time. The increase is only valid when the appointment duration and daily start values aren’t changed.
    • Don’t make the daily end time earlier when appointments are already present. Doing so creates overbooked slots and invalidates previous appointments.

    Bookable days
    • Adding days without impacting existing appointments.
    • Removing the bookable days when appointments have already been created invalidates past appointments.
    • For example:
      1. In your old configuration, suppose that Saturday is bookable and appointments are booked on Saturday.
      2. If you create a new configuration in which Saturday isn’t bookable, any appointments previously booked for Saturday are no longer valid.

    Include daily break
    • Don’t change the value of the Include daily break check box.
    • Don’t add the daily break time if this check box is cleared.
    • Don’t change the duration of the break.
    • Don’t set the break start time and end time to be the same as the daily start time and daily end time because it won’t generate bookable slots.