ISTQB CT-PT case studies
ISTQB CT-PT · Put your knowledge to work in context.
The ISTQB® Certified Tester Performance Testing (CT-PT) is a specialist-level qualification within the ISTQB® portfolio, which the official site describes as the leading global certification scheme in software testing, with 1.5 million exams administered and more than 1.1 million certifications issued in over 130 countries as of May 2025. According to ISTQB®, CT-PT "provides knowledge of the principal aspects of performance testing, including technical aspects, method-based aspects, and organizational aspects," and specifically covers basic concepts, measurements, activities, tasks, and tools. The ISTQB CT-PT case studies are 5 cases and about 4,217 words.
1Ticket Presale: Stress Test or Something Else?
An online ticket seller expects a concert presale. Current baseline is 1,200 concurrent users during a normal sale, with 8% of sessions reaching checkout and an SLA of p95 response time under 3 seconds for checkout and under 1.5 seconds for search.
881 words, about 4 min2Subscription API: Averages, Percentiles, and Little's Law
After a load test of a subscription API, the report states: 500 virtual users, 60-minute steady state, average response time 450 ms, throughput 900 requests/minute, error rate 1.0%, CPU 78%. The business sponsor rejects the result because customer complaints mention slow checkout.
828 words, about 4 min3Insurance Migration: Is 1,100 Transactions per Minute Enough?
An insurance company is migrating a policy administration system to a new Java stack. Production statistics for the busiest hour show 12,000 policy lookups, 1,800 quote calculations, 300 endorsements, and 120 payments.
814 words, about 4 min4Retailer Tool Sprawl and a Center of Excellence
A global retailer has three performance testing teams. Team A uses a commercial load tool with 50 virtual-user licenses and vendor scripts; Team B uses Apache JMeter in CI; Team C relies on an APM tool's synthetic checks.
844 words, about 4 min5Holiday Sale: The Two-Hour Pass and the Fourteen-Hour Risk
A travel booking platform passes a 2-hour load test at 1,500 concurrent users with p95 1.8 s and no errors. The site is expected to run at that load for 14 hours during a holiday sale.
850 words, about 4 min