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| Section | Objectives |
|---|---|
| Testing Quality Characteristics | - Compatibility Testing - Flexibility Testing - Usability Testing - Functional Testing |
| The Tasks of the Test Analyst in Risk-Based Testing | - Risk Analysis - Risk Control |
| The Tasks of the Test Analyst in the Test Process | - Involvement in Test Activities - Testing in the Software Development Lifecycle - Tasks Related to Work Products |
| Test Analysis and Test Design | - Data-Based Test Techniques - Behavior-Based Test Techniques - Experience-based Testing - Rule-Based Test Techniques |
| Software Defect Prevention | - Mitigating Recurrence of Defects - Defect Prevention Practices - Supporting Phase Containment |
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問題 #15
Your company, which specializes in medical software, has designed an application for use on smartphones and tablets that calculates a person's BMI, Body Mass Index.
How can a Test Analyst BEST contribute to interoperability testing for this application?
答案：A
解題說明：
The correct answer is A because interoperability testing verifies whether the test object can interact correctly with other components or systems, exchange information, and use the exchanged information correctly.
CTAL-TA v4.0 states that interoperability testing verifies compatibility with components or systems with which the test object is intended to interact, and that its goal is to verify that two or more systems can exchange information and mutually use the exchanged information. It also specifically identifies defects in data transformation, interpretation or use of exchanged data, communication flows, protocols, standards compliance, and end-to-end functionality as interoperability concerns.
For a BMI medical application, integration with a national health service system and the correct receiving and processing of a BMI data file directly tests external system interaction and exchanged-data correctness.
Option B is accessibility testing, not interoperability. Option C describes coexistence testing, which CTAL- TA separates from interoperability under compatibility testing. Option D is adaptability or cross-platform environment testing because it checks target devices and operating systems, not interaction with another system. Reference: CTAL-TA v4.0, Section 4.4 Compatibility Testing , especially Interoperability Testing
.
問題 #16
You have been appointed to be a TA in the development of a road traffic control application, which will be installed at busy road junctions to control the operation of traffic signal lights according to sensors that detect traffic volume on the various approaches to the junction. The project is still in the early stages of test planning, but it is already clear that despite a tight schedule its safety-critical nature demands careful and thorough testing.
You have been asked to decide whether automated test design would deliver benefits. Which characteristic of automated test design is MOST important for the development of this system?
答案：B
解題說明：
The correct answer is B . In this scenario, the system is safety-critical , the schedule is tight, and the project is still in early test planning. The dominant benefit of automated test design is therefore not convenience, formatting, or later maintenance; it is early defect prevention through modeling . CTAL-TA v4.0 states that when automating test design, the Test Analyst creates a test model and automatically generates testware from that model. It lists defect prevention as a key benefit because modeling for testing is an effective way of evaluating the quality of the test basis.
For a traffic-control system, incorrect or incomplete rules for sensor inputs, signal phases, priority handling, state transitions, or timing constraints could create dangerous behavior. Creating a model early forces the team to formalize those rules and exposes omissions, contradictions, unreachable states, ambiguous transitions, and missing guard conditions before implementation defects propagate. CTAL-TA's sample-exam answer guidance also confirms that early modeling of test conditions from the testing perspective is effective quality control of the test basis and helps prevent defects in later SDLC work products.
Option A is true but secondary. Option C is operationally useful but not safety-critical. Option D is a valid benefit, but post-release maintenance is less important than preventing specification defects early. Reference:
CTAL-TA v4.0, Sections 3.5.2 and 5.2.1 .
問題 #17
You are working on a project to replace an old sales and merchandising system with a new system that will be based on modern platforms. The old system Is still in production but is poorly documented and expensive to maintain. The new version will be developed using modern technology. The main requirements for the system are that it shall:
* Load sales data, sent electronically from the stores each evening, into a central database.
* Produce actual sales reports for the merchandisers, whose job is to manage stock levels in stores.
* Produce sales forecast reports based on a combination of sales history and forecasting parameters. The parameters will be entered by the merchandisers into a browser-based front end and the reports will be produced overnight. The users will be able to see the reports next day, on screen or in print, by requesting this through the browser.
Requirements 1 and 2 are satisfied by the existing system and will be rewritten with no significant changes.
Requirement 3 is new. The development will use your company's Agile SDLC, with 2-week iterations.
Technical skill levels in the team are high and the approach to automate test execution is aggressive. Each requirement will be specified with user stories, will be released only when complete, and will need more than one iteration. The main business benefit will come from requirement 3, which depends on the other two requirements, and the stakeholders are keen to get this into production as soon as possible.
Release planning has begun for requirement 3 and you need to know at a high level what the testing scope will be, to ensure that the correct resources will be available. Which functional test techniques will be MOST effective for this release?
a) Domain testing
b) Combinatorial testing
c) Random testing
d) CRUD testing
e) Scenario-based testing
f) Decision table testing
g) Exploratory testing
答案：B
解題說明：
The correct answer is C : domain testing, scenario-based testing, and decision table testing . Requirement
3 is new and business-critical. It involves entering complex forecasting parameters, generating reports overnight from sales history and parameters, and then viewing or printing those reports through the browser.
Domain testing is appropriate because forecasting parameters and sales-history values form input domains with partitions and boundaries. CTAL-TA v4.0 states that domain testing extends equivalence partitioning and boundary value analysis to domains with multiple parameters and complex partitions.
Scenario-based testing is also essential because the requirement describes an end-to-end user/business flow:
enter parameters, run overnight report generation, request report output, view or print result. CTAL-TA states that scenario-based testing evaluates behavior in realistic workflows and is often used in system and acceptance testing from the user's perspective.
Decision table testing fits because forecast calculation behavior is likely governed by business rules involving sales history, parameters, thresholds, and report-generation rules. CTAL-TA classifies decision table testing as a rule-based technique for stateless business rules. Random testing is inferior because the requirement is clearly specified, not poorly understood. CRUD testing is not the strongest match because Requirement 3 is not mainly an entity lifecycle problem.
問題 #18
You are a TA in the development of a road traffic control application, which will be installed at busy road junctions, to control the operation of traffic signal lights according to sensors that detect traffic volume. This safety-critical project is still in the early stages of test planning and the project schedule is tight.
The Test Manager has asked you if crowd testing should be included in the project's test strategy. You do NOT think it should. Which limitation of crowd testing MOST influences your view?
答案：D
解題說明：
The correct answer is A . Crowd testing can provide scale, diversity of devices, and real-world variety, but its major weakness for a safety-critical road traffic control system is the variability of tester skill and therefore the variability of test quality. CTAL-TA v4.0 discusses crowd testing as a technique that may be useful in some contexts but has limitations, including variability in tester capability, control, coordination, documentation, and confidentiality. For a safety-critical system, the decisive factor is not geographical inconvenience or volume of findings; it is the need for controlled, rigorous, repeatable, competent testing against safety-relevant behavior.
Traffic signal control software must be tested using disciplined techniques, traceable test conditions, formal models, carefully selected scenarios, and controlled environments. Incorrect behavior could cause accidents, traffic conflict, or unsafe signal timing. Crowd testers are unlikely to have the necessary domain knowledge, safety-testing discipline, access to representative simulation rigs, or ability to produce the evidence expected for a safety-critical project.
Option B is a real crowd-testing limitation, but coordination overhead is not the strongest objection here.
Option C may matter, but the question gives no special confidentiality driver. Option D is relevant, but documentation burden is secondary to the unacceptable variability in testing quality. Reference: CTAL-TA v4.
0, Section 3.5.1 Crowd Testing .
問題 #19
You are working on a project to build a purchasing system. The main requirements for the system are that it shall:
* Allow users to enter details of items that they would like to purchase and, from these details, create a purchase request.
* Take each purchase request through a workflow that will allow the requestor's line manager to approve the request, reject it, or return it for clarification / modification.
* Forward approved requests to the Purchasing Department.
* Allow purchasers to find the best available supplier for each approved request and place the request on that supplier as a purchase order.
The system is being developed following an Agile SDLC. Risk-based testing is practiced informally, discussion about what testing each user story will need being done in a risk-driven way during story refinement, but there is no central product risk register. Testing is exploratory, except for the acceptance tests for each story's acceptance tests. Operational profiles have been created to guide performance testing.
Regression test automation started late. The team want to automate all acceptance tests for every user story, but the test automation engineers are still playing catch up. They started with the tests that were easiest to automate, so the functional and non-functional coverage of the regression test pack is incomplete and random.
The current iteration is delivering a major change to the approval workflow and you, as a Test Analyst, have been tasked with defining the regression testing.
Which techniques would be MOST effective for selecting regression tests?
a) History-based, driven by the results of the regression tests run so far b) Risk-based, driven by the product risks and their traceability to the tests c) Operational profile-based, driven by the likely patterns of use of the relevant transactions d) Coverage-based, driven by the coverage obtained from use of relevant test techniques e) Impact analysis, driven by consultation with technical stakeholders to identify what might be affected.
答案：A
解題說明：
The correct answer is B because the most effective regression-selection combination in this situation is operational profile-based selection plus impact analysis . CTAL-TA v4.0 states that regression testing often cannot execute every regression test because of time, budget, environment, or data constraints, so appropriate regression tests must be selected and the scope must be reviewed every cycle. The syllabus identifies impact analysis as a regression selection technique that focuses tests on areas most likely to be affected by changed configuration items, and also recognizes operational-profile-based testing as useful for selecting tests according to likely usage patterns and critical business processes.
Here, the current change is a major approval workflow change , so impact analysis with technical stakeholders is essential to identify direct and indirect effects. Operational-profile-based selection is also appropriate because approval, rejection, clarification, forwarding, and purchase-order creation are transaction flows with realistic usage patterns. Option A is weak because history-based selection is unreliable when the existing regression pack is incomplete and randomly biased toward easy-to-automate tests. Option C is invalid because formal risk-based selection depends on product risks and traceability to tests, but the scenario explicitly says there is no central product risk register. Option D also includes the invalid risk-based pair.
Reference: CTAL-TA v4.0, Section 2.2 Risk Control / Regression Testing .
問題 #20
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