ISTQB CT-AT case studies
ISTQB CT-AT · Put your knowledge to work in context.
The ISTQB® Certified Tester Advanced Level Agile Technical Tester (CTAL-ATT) is an advanced-level qualification in the ISTQB® portfolio. Per the ISTQB® certification overview, it "provides a thorough introduction to the technical testing skills which are fundamental in organizations using an Agile development approach," and those skills "include testing and agile techniques, test automation approaches, and continuous deployment and delivery." That scope makes it relevant to testers, test analysts and technical testers who already work inside Agile teams and want to deepen the hands-on, engineering-side of their craft rather than test management or process leadership. The ISTQB CT-AT case studies are 5 cases and about 3,479 words.
1Quote Rules, Escaped Defects, and the Third Tester
Northwind Insurance runs two-week Scrum sprints with six developers, two testers, one product owner, and a business analyst. The quote-calculation feature has 34 eligibility rules that interact: customer age, region, vehicle group, claims history, and payment frequency.
766 words, about 4 min2A 420-Test Selenium Suite and a Twenty-Minute Commit Budget
An online retailer has 12 Scrum teams sharing one Selenium WebDriver suite of 420 end-to-end UI tests. The suite takes 38 minutes on four parallel agents and fails 22% of runs; triage shows 60% are timing or test-data issues, 25% are duplicate coverage, 15% are genuine defects.
698 words, about 3 min3Canary Releases, a Locked Table, and a Failed Rollback
ShopDirect deploys its e-commerce platform about 15 times per week using canary releases and feature flags. The platform includes a Java monolith, four Node.js services, PostgreSQL, and Redis.
675 words, about 3 min4Checkout Latency at 1,200 Virtual Users Before a Flash Sale
TicketWave sells concert tickets. During a load test with 1,200 virtual users over 30 minutes, the checkout API's 95th percentile response time rose from 600 ms to 4.2 seconds, error rate reached 8%, and CPU on the primary PostgreSQL server stayed at 55%.
698 words, about 3 min5A Kanban Queue of Eighteen Items Ready for Test
MediTrack is a Kanban team building a clinical-trial data capture system. Work items move from 'development done' to 'ready for test' and then to 'done'.
642 words, about 3 min