SIEM Evaluation: 40 Questions That Reveal Real Performance
Evaluation checklist with weighted scoring to assess false positive rates, hidden costs, and actual implementation timelines from SIEM vendors.
Scoring Framework
Score each question 1-5 based on vendor responses. Vendors scoring below 3.5 overall will likely cost 2x their quoted price and require 6+ months to deliver value. Focus heavily on Performance Reality and Total Cost sections—these predict deployment success better than feature checklists.
Evaluation Criteria
Performance Reality and False Positive Management
30% weightEvaluate actual system performance under realistic log volumes and the vendor's ability to minimize alert fatigue through proper detection tuning.
Sample Questions
- What's the false positive rate for your top 10 detection rules in the first 90 days, measured across your last 10 similar deployments?
- How does search and alerting performance degrade when we hit 150% of estimated daily log volume from Okta, Office 365, and endpoint agents?
- What's your median time to tune detection rules to under 10 false positives per week, and how many professional services hours does this require?
- Can you demonstrate your platform processing our actual Okta and firewall logs instead of sanitized demo data?
- What happens to real-time correlation during high log volume periods like security incidents or system updates?
Total Cost Transparency and Professional Services
25% weightAssess the vendor's honesty about complete costs including storage overages, professional services requirements, and integration licensing that can double budgets.
Sample Questions
- What's the itemized year-one cost including professional services, storage overages, integration licensing, and compliance modules for a 50-endpoint deployment?
- How many hours of your professional services are mandatory to reduce false positives to manageable levels, and what's your hourly rate?
- Which integrations with Okta, Office 365, and Palo Alto Networks require additional licensing beyond base pricing?
- What storage costs do we incur when enabling full endpoint visibility instead of basic log collection shown in demos?
- What additional hardware, software licenses, or network requirements are mandatory beyond your base platform cost?
Implementation Timeline and Resource Requirements
20% weightValidate realistic deployment timelines and resource requirements, as vendors commonly underestimate by 3-6 months for useful security alerting.
Sample Questions
- How many calendar days from contract signature until our analysts can triage security alerts without vendor support calls?
- What percentage of our detection rules and dashboards break during your major platform updates, and who fixes them?
- Can you provide 3 unscripted reference calls with customers who deployed in the last 12 months with similar compliance requirements?
- What infrastructure specifications and dedicated staff time are required beyond your base platform for a 50-endpoint deployment?
- How do you handle the 40-60 hours of rule tuning required to customize detection for our environment?
- What's the learning curve for our analysts to effectively use threat hunting and custom detection capabilities?
- Will you certify our existing IT consultants for deployment, or do we need your professional services team exclusively?
Integration Capabilities and API Limitations
15% weightEvaluate real-world integration performance with existing security tools, including sync times, API rate limits, and additional licensing requirements.
Sample Questions
- What's the sync latency for bi-directional integration with Okta user context and Office 365 security events?
- Do you provide API documentation and rate limits for integrations, or do these require premium licensing packages?
- How do you handle API failures and data sync interruptions with critical security tools during incidents?
- Can you demonstrate real-time correlation between our firewall logs, Okta events, and endpoint data without manual configuration?
- What happens to existing integrations when you release major platform updates or API version changes?
- Which of your 'native' integrations actually require third-party middleware or custom development work?
Support Quality and Vendor Lock-in Assessment
10% weightAssess support responsiveness for critical issues and evaluate data portability to avoid expensive vendor dependencies long-term.
Sample Questions
- What's your median resolution time for Severity 1 issues where our SIEM stops processing logs during active security incidents?
- Can you provide customer references specifically for critical support experience, not just sales references?
- What's the complete process and timeline to export all our data and configurations if we migrate to a different vendor?
- Do you provide data export in standard formats without requiring your professional services involvement or additional licensing?
- How do you handle support escalation to engineering teams when our custom configurations break after platform updates?
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