The CT-AI (Certified Tester AI Testing) exam, offered by iSQI under the ISTQB Certified Tester framework, validates your ability to test AI-based systems effectively. This credential is designed for quality assurance professionals who need to understand AI-specific testing challenges, from machine learning data validation to neural network behavior verification. This landing page guides you through the exam structure, core topics, and proven preparation strategies to help you succeed on your first attempt.
Use this topic map to guide your study for iSQI CT-AI (Certified Tester AI Testing) within the ISTQB Certified Tester path.
The CT-AI exam uses multiple-choice and scenario-based items to assess both conceptual knowledge and applied reasoning in AI testing contexts. Questions progress in difficulty and emphasize decision-making in realistic project situations.
Each question type demands both foundational knowledge and practical judgment, reflecting the skills needed in modern AI quality assurance roles.
A structured study plan mapped to the CT-AI syllabus ensures you master each domain systematically. Dedicate 4-6 weeks to preparation, allocating time proportionally to topic complexity and your current knowledge gaps.
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Quality Characteristics for AI-Based Systems, ML Functional Performance Metrics, and Methods and Techniques for the Testing of AI-Based Systems typically account for a larger share of exam items. However, all eleven domains are examinable, so balanced preparation across all topics is essential. Focus extra effort on areas where you have less hands-on experience.
Data quality directly determines model performance; poor training data leads to low metrics like precision and recall. In practice, you must validate data pipelines, detect drift, and interpret performance metrics together to diagnose whether failures stem from data issues or model design flaws. This connection appears frequently in scenario-based questions on the exam.
Experience with Python ML libraries (scikit-learn, TensorFlow), data exploration tools, and confusion matrix interpretation is valuable. Prioritize labs that involve training a simple classifier, evaluating it with multiple metrics, and detecting performance degradation on new data. Even brief hands-on work reinforces concepts far better than reading alone.
Candidates often confuse precision with recall, misinterpret what data drift means for model behavior, or overlook the importance of fairness testing in regulated contexts. Another frequent error is assuming traditional test case design applies unchanged to AI systems. Review the differences between AI and deterministic software testing carefully, and practice interpreting metrics in context.
In your final week, focus on timed practice tests and targeted review of topics where you scored lowest. Avoid learning new material; instead, reinforce weak areas and build confidence with full-length mocks. On the day before the exam, do a light review of key definitions and metrics, then rest well. Pacing during the exam itself matters too: allocate roughly 1-1.5 minutes per question and flag difficult items to revisit if time permits.
Which option gives the correct values for accuracy and precision from the confusion matrix?
Choose ONE option (1 out of 4)
From the confusion matrix:
True Positives (TP) = 15
False Positives (FP) = 5
False Negatives (FN) = 15
True Negatives (TN) = 65
Accuracy= (TP + TN) / Total
= (15 + 65) / 100
=80%
Precision= TP / (TP + FP)
= 15 / (15 + 5)
= 15 / 20
=75%
Section3.2 -- Functional Performance Criteriain the syllabus explains accuracy and precision exactly these ways when evaluating ML classification performance.
Option B is therefore the only correct pair of values.
An e-commerce developer built an application for automatic classification of online products in order to allow customers to select products faster. The goal is to provide more relevant products to the user based on prior purchases.
Which of the following factors is necessary for a supervised machine learning algorithm to be successful?
The syllabus explains that supervised learning requires correctly labeled data so the algorithm can learn the relationship between input features and output labels:
'In supervised learning, the algorithm creates the ML model from labeled data during the training phase. The labeled data is used to infer the relationship between the input data and output labels.'
(Reference: ISTQB CT-AI Syllabus v1.0, Section 3.1.1)
Upon testing a model used to detect rotten tomatoes, the following data was observed by the test engineer, based on certain number of tomato images.

For this confusion matrix which combinations of values of accuracy, recall, and specificity respectively is CORRECT?
SELECT ONE OPTION
To calculate the accuracy, recall, and specificity from the confusion matrix provided, we use the following formulas:
Confusion Matrix:
Actually Rotten: 45 (True Positive), 8 (False Positive)
Actually Fresh: 5 (False Negative), 42 (True Negative)
Accuracy:
Accuracy is the proportion of true results (both true positives and true negatives) in the total population.
Formula: Accuracy=TP+TNTP+TN+FP+FN\text{Accuracy} = \frac{TP + TN}{TP + TN + FP + FN}Accuracy=TP+TN+FP+FNTP+TN
Calculation: Accuracy=45+4245+42+8+5=87100=0.87\text{Accuracy} = \frac{45 + 42}{45 + 42 + 8 + 5} = \frac{87}{100} = 0.87Accuracy=45+42+8+545+42=10087=0.87
Recall (Sensitivity):
Recall is the proportion of true positive results in the total actual positives.
Formula: Recall=TPTP+FN\text{Recall} = \frac{TP}{TP + FN}Recall=TP+FNTP
Calculation: Recall=4545+5=4550=0.9\text{Recall} = \frac{45}{45 + 5} = \frac{45}{50} = 0.9Recall=45+545=5045=0.9
Specificity:
Specificity is the proportion of true negative results in the total actual negatives.
Formula: Specificity=TNTN+FP\text{Specificity} = \frac{TN}{TN + FP}Specificity=TN+FPTN
Calculation: Specificity=4242+8=4250=0.84\text{Specificity} = \frac{42}{42 + 8} = \frac{42}{50} = 0.84Specificity=42+842=5042=0.84
Therefore, the correct combinations of accuracy, recall, and specificity are 0.87, 0.9, and 0.84 respectively.
References:
ISTQB CT-AI Syllabus, Section 5.1, Confusion Matrix, provides detailed formulas and explanations for calculating various metrics including accuracy, recall, and specificity.
'ML Functional Performance Metrics' (ISTQB CT-AI Syllabus, Section 5).
Which ONE of the following hardware is MOST suitable for implementing Al when using ML?
SELECT ONE OPTION
A . 64-bit CPUs.
While 64-bit CPUs are essential for handling large amounts of memory and performing complex computations, they are not specifically optimized for the types of operations commonly used in machine learning.
B . Hardware supporting fast matrix multiplication.
Matrix multiplication is a fundamental operation in many machine learning algorithms, especially in neural networks and deep learning. Hardware optimized for fast matrix multiplication, such as GPUs (Graphics Processing Units), is most suitable for implementing AI and ML because it can handle the parallel processing required for these operations efficiently.
C . High powered CPUs.
High powered CPUs are beneficial for general-purpose computing tasks and some aspects of ML, but they are not as efficient as specialized hardware like GPUs for matrix multiplication and other ML-specific tasks.
D . Hardware supporting high precision floating point operations.
High precision floating point operations are important for scientific computing and some specific AI tasks, but for many ML applications, fast matrix multiplication is more critical than high precision alone.
Therefore, the correct answer isBbecause hardware supporting fast matrix multiplication, such as GPUs, is most suitable for the parallel processing requirements of machine learning.
Which of the following are the three activities in the data acquisition activities for data preparation?
The syllabus defines data acquisition as consisting of three steps:
''Data acquisition: The activity of acquiring data relevant to the business problem to be solved by an ML model, typically involving the activities of identifying, gathering and labelling data.''
(Reference: ISTQB CT-AI Syllabus v1.0, Section 4.1, page 33 of 99)