GEO Evidence Refresh SLA for Source Changes and Retesting

Learn how to establish a service-level agreement for refreshing GEO evidence to handle source failures and fact changes, ensuring AI answer accuracy.

Why GEO Evidence Needs an SLA

GEO content relies on external sources. When those sources change or fail, the facts your content presents can become outdated. If an AI system cites your content, it may pass along stale or incorrect information.

Without a structured process, evidence updates are often neglected, and your brand’s credibility in AI search can suffer.

An SLA (service-level agreement) for evidence refresh provides clear ownership and a defined workflow, ensuring that evidence remains accurate and trustworthy.

Consider a scenario: you publish a page that cites a government statistic. Six months later, the agency revises the number. If no one checks, your page still shows the old figure.

An AI assistant might then answer a user’s question with that outdated data, damaging your reputation for reliability. An SLA prevents this by assigning responsibility and setting review cycles.

An evidence refresh SLA is not just about fixing broken links. It is a governance framework that defines who owns each piece of evidence, how often it is reviewed, and what happens when a source fails or a fact changes.

It turns a reactive, ad-hoc process into a proactive, scheduled one. This is especially important because AI systems often pull from multiple sources; if your evidence is stale, you risk being omitted or contradicted.

Without an SLA, updates may be delayed indefinitely. Teams may not know who is responsible for a particular fact, or they may lack a clear process for verifying replacements. An SLA solves this by documenting roles, statuses, and timelines.

It also helps you prioritize: not all facts carry the same risk, so you can allocate resources where they matter most.

In practice, an SLA should include a central register of evidence items, each with an owner, a risk tier, and a review schedule. It should also define triggers for immediate review, such as a source going offline or a major policy change.

By formalizing these steps, you ensure that evidence refresh becomes a routine part of content maintenance, not an afterthought.

Fact Risk Tiers: Prioritizing Updates

Not all facts are equal. Some, if wrong, could cause serious harm or legal issues; others are merely descriptive. To manage your refresh workload, classify each fact into a risk tier.

This determines how quickly you must respond to changes and how often you review.

**High-risk facts** include safety information, legal disclaimers, financial figures, medical advice, or any claim that could lead to physical, financial, or reputational damage. For these, you need immediate updates.

If a source changes, you should retest and publish within hours or days. For example, if you cite a drug dosage or a tax rate, a change is urgent.

**Medium-risk facts** cover product specifications, pricing, or service details. These are important but not life-critical. A change might confuse customers but not cause major harm. Review these monthly or quarterly.

For instance, if you list a product’s dimensions and the manufacturer updates them, you should correct your page within a week or two.

**Low-risk facts** include general descriptions, historical background, or non-essential details. These can be reviewed less frequently, perhaps every six months or annually.

A minor error here is unlikely to cause significant issues, but it can still erode trust over time.

To implement tiers, create a simple matrix. For each evidence item, assign a tier based on the potential impact of an error. Document this in your SLA template. Then, set review frequencies and response times for each tier. For example:

| Tier | Example | Review Frequency | Max Response Time |
|——|———|——————|——————-|

This prioritization helps you allocate resources. You do not need to check every fact every day, but you must ensure that high-risk items are monitored closely.

When a change is detected, the tier dictates the urgency of the update and the depth of retesting required.

Source Types and Replacement Selection

When you cite a fact, you rely on a source. Sources vary in authority and reliability. Understanding source types helps you choose the best evidence and prepare for failures.

**Primary sources** are original, official, or first-hand. Examples include government publications, official company announcements, peer-reviewed research, and legal documents. These are the gold standard because they are closest to the origin of the fact.

Use them whenever possible.

**Secondary sources** interpret or report on primary sources. News articles, industry analyses, and reputable blogs fall here. They can be useful, but they may introduce errors or bias.

Use them when a primary source is unavailable, but verify their credibility.

**Tertiary sources** aggregate or summarize other sources, such as encyclopedias or database compilations. These are convenient but often lack depth and may be outdated. Use them with caution, and always trace back to the original if possible.

When a source fails—for example, a page returns a 404 error or is taken down—you need a replacement. The replacement must be of equal or higher authority.

If your primary source disappears, look for an official alternative, such as an archived version or a government update. If you were using a secondary source, try to find the primary source it referenced.

To select a replacement, verify three things: authority (is it official or reputable? ), timeliness (is it current? ), and relevance (does it support the same fact? ).

For example, if you cited a company’s press release and it is removed, check the company’s website for an updated statement. If that fails, look for coverage in major news outlets.

Document replacement sources in your SLA template. For each evidence item, list one or more backup sources. This way, when a failure occurs, you have a clear path forward. Also, note the date you verified the source and the date of the last check.

In practice, you might create a source hierarchy. For a given fact, list the primary source, then a secondary fallback, then a tertiary option. When the primary fails, you move down the list, but you must ensure the replacement meets your authority threshold.

Never replace a high-authority source with a low-authority one without justification.

By defining source types and replacement criteria, you reduce the risk of using unreliable evidence. This is a core part of your SLA, ensuring that every fact you publish has a verifiable and current foundation.

Change Triggers: When to Initiate Updates

To operationalize the above, use a structured register. Below is a template with the required fields. Fill one row per evidence item.

Use this register to track each fact. When a source fails, update the status and initiate the replacement process. When a fact changes, follow the tier-based response time. After updating a page, retest the AI answer to confirm accuracy.

This template is a practical tool. It turns your SLA into a living document. By maintaining it, you ensure that evidence refresh is systematic and accountable.

Evidence Ownership and Review Status

A GEO evidence refresh SLA depends on clear, actionable triggers that tell you when to update an evidence point. Without defined triggers, updates happen reactively or not at all, leaving your AI answers to rely on stale or broken sources.

The triggers fall into three categories: source failure, fact change, and periodic review.

**Source failure** is the most urgent trigger. It occurs when a source becomes unavailable or unreliable. Common signs include broken links, HTTP 404 errors, content removal, or a domain that no longer resolves.

For example, if your evidence cites a specific page and that page returns a 404, the evidence is no longer verifiable. You should monitor sources for these failures using automated link checkers or manual reviews.

When a failure is detected, the evidence owner must be notified immediately, and the evidence should be marked as "in review" pending replacement.

**Fact change** is a subtler trigger. It happens when the underlying fact or data in a source is updated, or when new facts emerge that contradict or supersede the existing evidence.

For instance, if a source originally stated a statistic that is later revised, the evidence must be updated to reflect the new information.

This trigger requires you to monitor authoritative sources for updates, which can be done through RSS feeds, alerts, or periodic manual checks.

When a fact change is detected, the evidence owner must assess the impact on the AI answer and initiate the update workflow.

**Periodic review** is a scheduled trigger that ensures evidence is refreshed even if no immediate failure or change is detected. These intervals are not arbitrary; they reflect how quickly facts in each domain tend to change.

For example, a high-risk fact like a drug dosage should be checked monthly, while a low-risk fact like a historical date might only need a semi-annual check.

To implement these triggers, you need a monitoring system that tracks source health and content changes. This can be as simple as a spreadsheet with manual checks or as sophisticated as automated scripts that crawl sources and compare content hashes.

The key is to define who is responsible for monitoring and what actions to take when a trigger fires. For each evidence point, the SLA should specify the trigger type, the monitoring method, and the response time.

For example, a source failure might require a response within 24 hours, while a periodic review might allow a week.

Page Updates and AI Answer Retesting

Accountability is the backbone of any SLA. Without a clear owner for each evidence point, updates can fall through the cracks. Therefore, assign an owner to every evidence point.

The owner is responsible for monitoring the source, initiating updates when triggers fire, and ensuring the evidence remains accurate.

In a small team, one person might own all evidence; in a larger organization, ownership might be distributed by topic or source type.

To track the state of each evidence point, define a set of review statuses. The statuses should reflect the lifecycle of an evidence point:

– **Pending**: The evidence has been identified but not yet fully vetted or published.
– **In review**: The evidence is being checked due to a trigger (source failure, fact change, or periodic review).
– **Updated**: The evidence has been refreshed and is current.
– **Deprecated**: The evidence is no longer valid and has been removed or replaced.

Each status change must be logged with a timestamp and the operator who made the change. This log provides an audit trail that demonstrates SLA compliance and helps identify bottlenecks.

For example, if an evidence point remains "in review" for weeks, the log will show who is responsible and when the review started.

To illustrate, consider an evidence point with ID E-001 that cites a government statistics page. The owner is Jane Doe. On January 1, the source returns a 404 error. Jane is notified, and she changes the status to "in review" at 10:00 AM.

She then searches for a replacement source, finds an updated page, and updates the evidence on January 3, changing the status to "updated" at 2:00 PM. The log records both changes with timestamps and operator IDs.

Ownership also involves periodic checks even when no trigger fires. The owner should proactively review their assigned evidence points according to the risk-based schedule. This ensures that evidence does not become stale silently.

The SLA should specify the owner’s duties, including monitoring frequency, response times, and documentation requirements.

Once an evidence point is updated, the changes must be propagated to the pages and AI answers that rely on it. This is not a simple find-and-replace; it requires a structured workflow to ensure consistency and accuracy.

**Page updates** follow your standard content publishing workflow. When an evidence point changes, the affected pages must be edited to reflect the new source or fact. This involves updating the text, links, and citations.

Each page update should be logged with a change description, the date, and the editor. The SLA should specify how quickly page updates must be completed after an evidence update.

**AI answer retesting** is critical because AI systems may have cached or indexed the old information. After updating the evidence and pages, you must retest the AI answers that use that evidence.

Retesting involves running standard queries that are designed to elicit the fact in question. For example, if the evidence is about a company’s founding year, you would ask the AI "When was [company] founded?"

and compare the output before and after the update. The retest should verify that the AI now provides the correct, updated answer and no longer cites the old source.

Retest results should be recorded as evidence of SLA compliance. For each retest, log the query, the date, the AI’s response, and whether it matches the expected answer.

This record serves as proof that the refresh process is working and helps identify AI systems that are slow to update.

If an AI continues to provide outdated information after a reasonable period, you may need to escalate the issue or consider alternative strategies, such as updating structured data or submitting new content.

To manage this process, use the following SLA template. This template is a fillable artifact that you can adapt to your needs. Each field is defined below.

| Evidence ID | Fact risk tier | Source type | Owner | Review status | Last review date | Next review date | Replacement source list | Page update status | AI retest result |
|————-|—————-|————-|——-|—————|——————|——————|————————-|——————–|——————|
| | | | | | | | | | |

– **Evidence ID**: A unique identifier for each evidence point (e.g., E-001).
– **Fact risk tier**: High, medium, or low, based on the impact of an error.
– **Source type**: Primary (original research or official data), secondary (analysis or summaries), or tertiary (aggregators or encyclopedias).
– **Owner**: The person responsible for monitoring and updating the evidence.
– **Review status**: Pending, in review, updated, or deprecated.
– **Last review date**: The date the evidence was last checked or updated.
– **Next review date**: The date the next periodic review is due, based on the risk tier.
– **Replacement source list**: A list of candidate sources to use if the current source fails or becomes outdated.
– **Page update status**: Whether the associated pages have been updated (e.g., pending, in progress, done).
– **AI retest result**: The outcome of the AI answer retest (e.g., pass, fail, not yet tested).

By using this template, you can track every evidence point through its lifecycle, ensuring that your GEO evidence remains fresh and your AI answers stay accurate.

Remember, the goal is not just to update evidence but to demonstrate that you have a systematic process in place.

Next step

Download the SLA template and start building your evidence refresh plan.