Category: ISMS Clauses and Planning
Communication
Simply put
Communication is the act or process of transferring information from one place, person, or system to another, whether through words, signs, behavior, or digital messages. Its precise definition is debated, as the term spans many forms and contexts.
Formal definition
Communication is generally defined as the transmission or exchange of information, ideas, thoughts, and meanings among parties, using messages conveyed through spoken words, written text, signs, sounds, behavior, or digital channels. The exact definition is disputed across disciplines, and it encompasses multiple forms, modes, and contexts of message exchange.
Why it matters
Communication is foundational to how information moves between people, teams, and systems, and its effectiveness directly shapes whether shared understanding is achieved. Because the precise definition is disputed across disciplines, the term covers a wide range of forms and contexts, from spoken words and written text to signs, behavior, and digital channels, each carrying its own expectations and potential for misinterpretation.
In practice, the quality of communication influences whether information is transferred accurately from one place, person, or system to another. When messages are exchanged clearly, parties can generate shared meaning; when they are ambiguous or incomplete, the intended information can be lost or distorted. This matters wherever coordinated action depends on people and systems reliably interpreting the same message.
Because communication spans many modes and contexts, no single approach fits every situation. The appropriate form, spoken, written, or digital, depends on the parties involved and the purpose of the exchange, which is why understanding communication as a process rather than a fixed act helps in selecting the right method for a given context.
Who it's relevant to
Individuals in interpersonal interaction
Communication is described as an essential part of interpersonal interaction, involving the transfer of information from one person to another through words, signs, or behavior.
Those exchanging ideas and information across contexts
Anyone exchanging information, ideas, thoughts, and emotions, whether through spoken words, written texts, facial expressions, or digital channels, relies on communication to convey and interpret messages within and across different contexts.
Scholars and disciplines studying message exchange
The field of communication studies focuses on how people use messages to generate meanings across various contexts and examines all forms and modes of communication, reflecting that its precise definition remains disputed.
Inside Communication
Internal Communication
The processes by which an organization conveys information about its security responsibilities, policies, roles, and control objectives to its own personnel. Within SOC 2, this connects to the Common Criteria addressing how information is communicated internally to support the functioning of internal control; within ISO 27001, it relates to the clause 7.4 requirement to determine the need for internal communications relevant to the ISMS.
External Communication
The mechanisms for communicating with external parties such as customers, vendors, business partners, and other interested parties about security commitments, obligations, and incidents. In ISO 27001 this is also addressed under clause 7.4, which requires the organization to determine what, when, with whom, and how it communicates externally regarding the ISMS.
Communication of Roles and Responsibilities
The conveying of assigned security responsibilities and authorities so that personnel understand their obligations. This supports the operating effectiveness of controls, which in a SOC 2 Type II examination is evaluated over the defined review period rather than only at a point in time.
Incident and Deficiency Communication
The channels through which security events, control deficiencies, and weaknesses are reported to appropriate parties for response. The existence and operation of these channels is typically evaluated as part of the controls covered, though a report or certificate attests only to the controls and scope covered and does not guarantee freedom from breaches.
Documented Communication Parameters
The determination of what will be communicated, when, with whom, and how it will be carried out. ISO 27001 clause 7.4 frames these parameters explicitly for the ISMS; SOC 2 addresses communication qualitatively through the applicable Trust Services Criteria.
Common questions
Answers to the questions practitioners most commonly ask about Communication.
Is a formal, standalone communications policy required to satisfy communication expectations in SOC 2 or ISO 27001?
Not necessarily as a single standalone document. In SOC 2, the Common Criteria include communication-related points of focus, but auditors typically evaluate whether communication objectives are met through the combination of policies, procedures, and evidence rather than requiring one specific policy artifact. In ISO 27001, clauses 4 through 10 include communication requirements (notably around determining what to communicate, when, with whom, and how), but the standard does not mandate a particular document title or format. How communication is documented depends on the scope, the auditor or certification body, and how the organization structures its management system.
Does effective communication mean an organization only needs to inform its own employees?
No. Communication in both frameworks generally spans internal and external parties. SOC 2's Common Criteria address communicating information both internally and to external users relevant to the achievement of the service organization's objectives, which can include customers and other interested parties depending on scope. ISO 27001's clauses similarly require determining the need for internal and external communications relevant to the ISMS. The specific audiences and channels vary by scope and the applicable criteria selected.
How do I demonstrate communication controls during a SOC 2 Type II examination?
Because a Type II assesses operating effectiveness over a defined review period, you would typically retain evidence showing communication activities occurred throughout that period rather than at a single point in time. Examples may include records of policy distribution, security awareness communications, incident notifications, and channels for reporting concerns. The exact evidence and sampling approach depend on the CPA firm's scoping decisions and the criteria in scope, and the report attests only to the controls and period covered.
What does ISO 27001 expect an organization to define regarding communication?
The ISMS requirements in clauses 4 through 10 generally call for the organization to determine the need for internal and external communications relevant to the information security management system, including what will be communicated, when, with whom, and the processes for doing so. The standard focuses on the management system requirement itself; how you meet it is informed by your context, scope, and risk assessment rather than prescribing fixed content.
How does communication relate to Annex A reference controls versus the ISMS clauses?
In ISO 27001, the certifiable communication requirements sit within the clauses (4 through 10) of the management system. Annex A lists reference controls that are selected via a Statement of Applicability and informed by risk assessment, and some of those controls can support communication-related objectives. The clause requirements and Annex A controls should not be conflated; the clauses set the ISMS obligations, while Annex A provides reference controls whose applicability depends on your risk decisions and the version of the standard in use.
Can I reuse the same communication evidence to satisfy both SOC 2 and ISO 27001?
Some overlap is often possible, and mapping between the two frameworks can be partial, but satisfying one does not automatically satisfy the other. SOC 2 evaluates communication against the applicable Trust Services Criteria as part of a CPA attestation, while ISO 27001 evaluates it against ISMS clause requirements as part of a certification against a management system standard. In most engagements you can leverage shared artifacts, but you should confirm that the evidence meets each framework's specific criteria, scope, and the expectations of the respective auditor or certification body.
Common misconceptions
The communication requirements in SOC 2 and ISO 27001 are the same and satisfying one automatically satisfies the other.
Mapping between the two frameworks is possible but partial. SOC 2 addresses communication through the Trust Services Criteria (with Security, the Common Criteria, being required and other categories optional based on scope), while ISO 27001 addresses it through clause 7.4 of the ISMS requirements. Satisfying communication expectations in one framework does not automatically satisfy the other.
Communication controls are a fixed mandatory checklist that every organization must implement identically.
Outcomes depend on the auditor, certification body, scope, and applicable criteria. In ISO 27001, communication needs are determined by the organization under clause 7.4; in SOC 2, the relevant criteria and how they are met depend on the scoping decisions. Specific approaches typically vary rather than being universally mandated.
Demonstrating good communication practices in a SOC 2 report or ISO 27001 certificate guarantees the organization will not experience a security incident.
A SOC 2 report attests only to the controls and period covered, and an ISO 27001 certificate covers only the defined scope of the ISMS. Neither guarantees freedom from breaches; they reflect the design and, in a Type II examination, operating effectiveness of the controls within the stated boundaries.
Best practices
Define your communication parameters explicitly, what is communicated, when, with whom, and how, to align with ISO 27001 clause 7.4 and to provide clear evidence for a SOC 2 examination.
Distinguish internal from external communication channels and document each, since they serve different audiences and support different control objectives.
Ensure security roles and responsibilities are communicated to personnel in a way that can be evidenced over time, recognizing that a SOC 2 Type II assesses operating effectiveness across the review period.
Establish and maintain channels for reporting security incidents, control deficiencies, and weaknesses to the appropriate parties.
Map communication controls between SOC 2 and ISO 27001 only as a partial cross-reference, and validate coverage against each framework's own requirements rather than assuming equivalence.
Scope communication practices to the boundaries covered by your report or certificate, and avoid overstating assurance beyond the controls and period or ISMS scope actually assessed.