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Control Institute
Category: Logging and Monitoring

Use of Monitoring Systems

Also known as: System Monitoring, Monitoring System, Security Monitoring
Simply put

The use of monitoring systems refers to the tools and processes an organization employs to continuously track, evaluate, and manage the health, performance, and security of its IT systems. These systems collect and analyze information so that teams can spot issues, respond to problems, and confirm that controls are working as intended. In a compliance context, evidence from monitoring typically helps demonstrate that security controls operate over time.

Formal definition

The use of monitoring systems encompasses the framework of tools, processes, and technologies that enable an organization to track, evaluate, and manage IT and security operations, supporting activities such as configuration and security management, backup and restore, patch management, and real-time performance measurement against defined goals. In SOC 2 examinations, monitoring activities and their outputs typically serve as evidence supporting the suitability of design (Type I) and operating effectiveness (Type II) of controls over the review period, and can relate to the Security (Common Criteria) category as well as optional categories such as Availability, depending on scope. In an ISO/IEC 27001 ISMS, monitoring, measurement, analysis, and evaluation are addressed within the clauses 4-10 requirements, and specific reference controls relating to logging and monitoring may be selected via the Statement of Applicability from Annex A based on risk assessment. The precise controls, tooling, and coverage vary by engagement, scope, and applicable criteria; monitoring outputs attest only to what is covered and observed and do not by themselves guarantee freedom from incidents or breaches.

Why it matters

Monitoring systems are central to demonstrating that security controls are not merely designed on paper but function over time. In a SOC 2 examination, the outputs of monitoring activities typically serve as evidence supporting both the suitability of design (Type I) and, over a defined review period, the operating effectiveness (Type II) of controls. Without monitoring, an organization has little objective basis for showing an auditor that its controls operated consistently rather than only at a single moment.

In an ISO/IEC 27001 ISMS, monitoring, measurement, analysis, and evaluation are addressed within the clauses 4-10 requirements, and specific reference controls relating to logging and monitoring may be selected via the Statement of Applicability from Annex A based on the organization's risk assessment. Monitoring therefore supports both the continuous improvement expected of the management system and the ability to detect and respond to issues before they escalate. It provides managers with information on progress toward defined goals, using both anticipatory measures to prevent problems and detective capabilities to catch them.

It is important to recognize the boundaries of what monitoring provides. Monitoring outputs attest only to what is within scope and what is actually observed; they do not, by themselves, guarantee freedom from incidents or breaches. The precise controls, tooling, and coverage vary by engagement, scope, and applicable criteria, so the value of monitoring in any given audit or certification depends heavily on how it is scoped and implemented.

Who it's relevant to

Compliance Managers
Compliance managers rely on monitoring outputs as evidence that controls operate over time, which is central to both SOC 2 Type II reporting and ISO 27001 ISMS requirements. They typically need to ensure that monitoring coverage aligns with the scope and applicable criteria selected for each engagement.
Auditors and Assessors
In a SOC 2 examination, auditors examine monitoring activities and their outputs when evaluating the suitability of design (Type I) and operating effectiveness (Type II) of controls over the review period. The evidence attests only to what is covered and observed, so auditors assess whether the monitoring in place is sufficient for the criteria in scope.
Security Engineers and IT Operations
These teams implement and operate the monitoring tooling used for configuration and security management, backup and restore, patch management, and real-time performance measurement. They are responsible for keeping systems running smoothly and for surfacing issues so they can be responded to.
GRC Professionals
GRC professionals map monitoring capabilities to the relevant Trust Services Criteria and to ISO 27001 Annex A reference controls selected through the Statement of Applicability. They help ensure that monitoring supports risk management goals while recognizing that satisfying one framework does not automatically satisfy the other, since mapping between SOC 2 and ISO 27001 is partial.

Inside Use of Monitoring Systems

Continuous Monitoring Activities
Ongoing collection and review of security-relevant data, such as system logs, network traffic, and access events, used to detect anomalies and support control operation. In SOC 2 engagements, monitoring is often assessed under the Common Criteria as part of demonstrating that controls operate effectively over the review period.
Log Aggregation and Retention
Centralized capture and storage of event data from systems and applications. The specific retention periods and sources included typically depend on scope, applicable criteria, and the organization's risk assessment rather than a single fixed rule.
Alerting and Escalation
Defined thresholds and workflows that route detected events to responsible personnel for investigation. These mechanisms support incident response processes and are frequently examined when assessing operating effectiveness in a SOC 2 Type II engagement.
Relationship to ISO 27001
Under ISO/IEC 27001, monitoring supports the ISMS requirements in clauses 4 through 10, including performance evaluation, and may be addressed by relevant Annex A reference controls selected via the Statement of Applicability and informed by risk assessment. Specific Annex A control references depend on the edition (for example, the 2013 versus the 2022 revision).
Review and Analysis
Human or automated evaluation of monitoring output to identify potential control failures or security events. The frequency and depth of review typically vary by scope and by the auditor's or certification body's expectations.

Common questions

Answers to the questions practitioners most commonly ask about Use of Monitoring Systems.

Does implementing monitoring systems mean my SOC 2 report guarantees we won't be breached?
No. A SOC 2 report attests only to the controls in scope and their operation over the period covered by the examination. Monitoring systems can support the detection controls a CPA firm evaluates, but the resulting report does not guarantee freedom from breaches. It reflects the auditor's opinion on the suitability of design (Type I) or design and operating effectiveness (Type II) of the covered controls during the defined review period, and says nothing about events outside that scope or period.
Is there a single mandatory monitoring tool or configuration required to pass SOC 2 or achieve ISO 27001 certification?
No. Neither framework prescribes a specific product or configuration. Under SOC 2, monitoring supports the Trust Services Criteria in scope, and the auditor evaluates whether your chosen approach is suitably designed and, for Type II, operating effectively. Under ISO 27001, monitoring-related expectations flow from the ISMS requirements in clauses 4 through 10 and from any applicable Annex A reference controls selected through your Statement of Applicability and risk assessment. What is appropriate depends on scope, risk, the auditor or certification body, and the criteria or controls you have selected.
How do monitoring systems typically support the Trust Services Criteria in a SOC 2 examination?
In most engagements, monitoring systems provide evidence for the Common Criteria (Security), which is the only required category, and can also support optional categories such as Availability where they track uptime and performance. The specific way monitoring maps to criteria depends on the scope you select. For a Type II examination, you would typically retain logs, alerts, and review records across the review period so the auditor can assess operating effectiveness rather than just design at a point in time.
What evidence should we retain from monitoring systems for an audit or certification?
Depending on scope and the auditor or certification body, organizations typically retain records showing that monitoring occurred and was acted upon, such as alert logs, tickets or investigation records for triggered events, and evidence of periodic review. For a SOC 2 Type II, evidence generally needs to cover the full review period. For ISO 27001, evidence typically demonstrates that monitoring supports the ISMS requirements and any relevant Annex A controls selected in your Statement of Applicability. Exact retention expectations vary, so confirm them with your assessor.
How can the same monitoring program support both SOC 2 and ISO 27001?
Mapping between the two frameworks is possible but partial. A single monitoring capability can produce evidence used in both a SOC 2 examination and an ISO 27001 certification, but the frameworks evaluate it differently, SOC 2 against the Trust Services Criteria in scope, and ISO 27001 against the ISMS requirements and selected Annex A reference controls. Satisfying one does not automatically satisfy the other, so you should confirm that your monitoring evidence meets the distinct expectations of each engagement rather than assuming equivalence.
How does monitoring relate to design versus operating effectiveness in a SOC 2 Type I versus Type II?
A Type I examination assesses the suitability of the design of controls at a point in time, so it may consider whether monitoring is configured appropriately as of that date. A Type II examination assesses both design and operating effectiveness over a defined review period, so it typically requires evidence that monitoring operated consistently throughout that period. The length of the review period varies and is set through scoping decisions rather than fixed by the standard, which affects how much monitoring evidence you need to accumulate.

Common misconceptions

Deploying a monitoring system is enough to satisfy a SOC 2 Type II examination.
A SOC 2 Type II examines both the design and the operating effectiveness of controls over a defined review period, so evidence that monitoring actually operated as described throughout that period is typically required. Merely having the tooling in place, without demonstrated operation, generally does not satisfy the assessment, and the report attests only to the controls and period covered.
A specific monitoring tool or configuration is mandatory across both frameworks.
Neither framework generally prescribes a particular product. In most engagements the appropriate monitoring approach depends on scope, applicable Trust Services Criteria, and, for ISO/IEC 27001, the risk assessment and Statement of Applicability. Requirements are stated in qualified terms rather than as universal mandates unless the standard itself requires them.
Effective monitoring guarantees the organization will not experience a breach.
Monitoring supports detection and control operation but does not eliminate risk. A SOC 2 report attests only to the controls and period covered and does not guarantee freedom from breaches, and an ISO 27001 certificate covers only the defined scope of the ISMS.

Best practices

Align monitoring coverage with the systems and data in scope, and map it to the applicable Trust Services Criteria for SOC 2 or the ISMS scope and Statement of Applicability for ISO/IEC 27001.
Retain monitoring evidence, such as logs and alert records, across the full review period so operating effectiveness can be demonstrated in a SOC 2 Type II engagement.
Define clear alerting thresholds and escalation workflows, and document how detected events feed into incident response processes.
Base the depth and frequency of monitoring on a documented risk assessment rather than assuming a single fixed standard, since expectations typically vary by auditor, certification body, and scope.
Periodically review monitoring output and configurations to confirm they remain aligned with current systems and identified risks.
When pursuing both frameworks, recognize that monitoring evidence may partially map across them, but confirm that each framework's specific requirements are separately satisfied rather than assuming equivalence.