CEO Executive Assistant
The practical research question is: How should a CEO office review calendar access so assistants can coordinate time without gaining unnecessary visibility or authority?
This review uses current primary and authoritative guidance checked on 2026-10-02. Google Workspace and Microsoft both document role-based calendar sharing with different permission levels. NIST frames least privilege and periodic account review as core access-control practices.
Start with an outcome that another person can inspect. For this workflow, record principal, calendar, business purpose, permission level, grant source, approver, sensitive-event treatment, connected application, last use, review date, and removal trigger.
Consider this scenario: A CEO has two current assistants, a former chief of staff, a recruiting coordinator, and several third-party scheduling tools attached to the calendar. Some can only see availability; others can edit events or manage sharing.
- Share your calendar with someone: Google Calendar Help; checked 2026-10-02.
- Calendar sharing in Microsoft 365: Microsoft Learn; checked 2026-10-02.
- Security and Privacy Controls for Information Systems and Organizations: National Institute of Standards and Technology; checked 2026-10-02.
Interpret product permissions in their own terms
Google Calendar distinguishes seeing availability, seeing event details, changing events, and making changes to sharing. Microsoft environments can combine folder permissions, delegate behavior, mailbox settings, and organization policy. Similar labels do not guarantee identical effects. The review should cite the product’s current administrative view and then test the effective result with a controlled event.
Google’s sharing guidance also notes that administrators may restrict external sharing. That means a user’s intended grant may be broader or narrower than the effective organization setting. Microsoft’s documentation describes different sharing behavior within and outside an organization. A reviewer should not copy a role name from a spreadsheet and assume it proves what the delegate can see.
NIST SP 800-53 treats least privilege, account management, and review as continuing control activities. It does not prescribe a CEO-calendar template. The practical implication is to grant only the capabilities needed for the stated role, review them when people or systems change, and retain evidence that removal actually occurred.
Investigate a former delegate who still appears active
Suppose a former chief of staff remains listed with editing rights six months after changing roles. The current assistant believes access was kept for occasional board support. The former chief of staff says they no longer use it, yet the administration screen shows recent activity from a connected mobile client.
The reviewer should preserve the relevant audit facts, confirm whether the activity belongs to the person or an application, and identify the original approver. If no current business purpose exists, revoke the grant and connected sessions through the approved administrative process. Test that the former account can no longer view or change a controlled event. Do not inspect unrelated executive event contents to prove the control.
If occasional board support remains legitimate, replace indefinite editing with the narrowest access that supports that work, limited to the relevant calendar or period. Name the current owner and expiry. A former title is not a business purpose, and convenience is not enough to justify standing access to executive movements and relationships.
Review private events and sensitive calendars separately
Private-event behavior can surprise both executives and delegates. A label may hide details from some viewers while allowing an editor to see or alter more than expected. Create a harmless test event using the same setting, invite a controlled account, and observe the result at each permission level. Record only the observed capability.
Some offices use separate calendars for board, recruiting, travel, or personal commitments. Review each calendar’s purpose and sharing boundary. A scheduling assistant may need availability across several calendars but editing rights on only one. Consolidating everything into a single broad grant may simplify setup while defeating the intended separation.
Calendar titles themselves can disclose deals, health appointments, candidates, security movements, or confidential counterparties. Where availability is enough, reduce exposed detail. Where an assistant needs context to coordinate, ensure that context is appropriate for the role and system rather than hiding it in a vague private note outside governance.
Make removal evidence usable
Record the identity, calendar, prior effective capability, reason for removal, administrative action, test result, and time. If an application token or group membership supplied access, document that path. A screenshot of a user list may not prove that an OAuth application lost its token or that a cached mobile session was invalidated.
Failed removal needs escalation because it reveals an architecture or ownership problem. The reviewer should not repeatedly click controls without understanding the grant path. Involve the system administrator or security owner, contain access as appropriate, and retest after correction.
The final review should leave fewer unexplained grants, a current owner for every exception, and direct observations of sensitive behavior. It should not create a parallel archive of calendar contents. Good evidence proves the permission decision while preserving the confidentiality the control exists to protect.
Report unresolved risk plainly. If a legacy integration cannot expose its scopes, the review should not mark it approved because nobody observed misuse. Record the unknown capability, business dependence, compensating restriction, accountable owner, and date by which the tool must be tested, replaced, or removed. This distinguishes a conscious temporary risk decision from an access grant that escaped review through technical opacity.
Examine what delegated access exposes beyond scheduling
Calendar access can reveal more than availability. Event titles, attendee lists, locations, conferencing links, attachments, and private-event metadata may disclose negotiations, health matters, investigations, or travel. A reviewer should compare each delegate’s job with the fields the product actually exposes at the assigned permission level. “Needs to schedule” does not automatically justify reading event detail, and hiding detail may still reveal a sensitive pattern through time and attendance.
Shared resources create a different problem. A conference-room calendar may be broadly visible while its event attachments inherit access from another system. Test a representative booking as the delegate, not as an administrator, and inspect the linked document separately. Record the result by resource because the calendar permission screen may not describe downstream sharing.
Handle role changes without destroying continuity
When an assistant changes executives, immediate removal from the former calendar may be correct, but open invitations and recurring series still need an accountable owner. Inventory future events created or controlled by the departing delegate. Transfer ownership where the platform supports it; otherwise cancel and recreate the series under a durable account or current owner. Do not preserve excessive access merely to avoid rescheduling work.
For leave coverage, grant the narrowest temporary permission with an end date tied to the coverage period. At expiry, verify removal from the platform and sample one formerly visible event from the backup user’s account. This is stronger evidence than a screenshot of the administrator’s settings because it tests the user’s effective access.
Resolve discrepancies between configuration and observation
If the permission report says access was removed but the user still sees an event, investigate caching, group membership, shared mailbox inheritance, and direct event invitations. Each pathway has a different remedy. Preserve the test account, event identifier, time, and observed fields so the administrator can reproduce the condition. Closing the review requires evidence from the user view and the controlling system, not a general assurance that permissions “look right.”
Use group membership as a separate review surface
A delegate may gain calendar visibility through an organizational group even when no direct grant appears on the calendar. Export relevant group membership and compare it with the resource’s sharing rules. Dynamic groups deserve special attention because a title, department, or location change can add access without a calendar administrator acting. Record the rule that produced membership, not only the resulting user list.
When access is justified through a group, assign an owner to both the group and the calendar rule. A calendar owner cannot certify access accurately if another team can change membership without notice. For sensitive calendars, require review when the group rule changes and sample a newly added member’s effective view.
Close the review with decisions, not screenshots
For every discrepancy, record whether access was retained, reduced, removed, or transferred, plus the authority for that choice. A settings screenshot is supporting evidence, not the conclusion. It may omit inherited permissions and becomes stale immediately. The final record should link the observed user view, administrative configuration, owner decision, and follow-up date.
Report unresolved technical behavior separately from accepted business access. If cached visibility cannot be reproduced consistently, restrict the account while the platform owner investigates. Do not mark the review complete because the interface eventually stopped showing the event.
Schedule the next review from the conditions that create risk. A static annual date may be adequate for a stable team, while frequent role changes or sensitive projects justify a shorter interval. Keep event-driven triggers for departures, executive changes, new integrations, and permission-model updates. The owner should be able to explain why the interval fits the exposure instead of inheriting a date from an unrelated access review.