Question 1

Assume you are the Test Manager in charge of independent testing for avionics applications.

You are in charge of testing for a project to implement three different CSCI (Computer Software

Configuration Item):

- a BOOT-X CSCI that must be certified at level B of the DO-178B standard

- a DIAG-X CSCI that must be certified at level C of the DO-178B standard

- a DRIV-X CSCI that must be certified at level A of the DO-178B standard

These are three different software modules written in C language to run on a specific hardware platform.

You have been asked to select a single code coverage tool to perform the mandatory code coverage

measurements, in order to meet the structural coverage criteria prescribed by the DO-178B standard. This

tool must be qualified as a verification tool under DO-178B.

Since there are significant budget constraints to purchase this tool, you are evaluating an open-source tool

that is able to provide different types of code coverage. This tool meets perfectly your technical needs in

terms of the programming language and the specific hardware platform (it supports also the specific Ccompiler).

The source code of the tool is available.

Your team could easily customize the tool to meet the project needs. This tool is not qualified as a

verification tool under the DO-178B.

Which of the following are the three main concerns related to that open-source tool selection?

Options :

A : Does the tool support all the types of code coverage required from the three levels A, B, C of the DO178B standard?

B : Does the tool have a good general usability?

C : What are the costs to qualify the tool as a verification tool under the DO-178B?

D : Is the installation procedure of the tool easy?

E : Does the tool require a system with more than 4GB of RAM memory?

F : Is the licensing scheme of the tool compatible with the confidentiality needs of the avionics company?

Answer: A,C

Question 2

Assume you are working on a CAS (Conditional Access System) for Pay-TV that allows the access,

selection and transfer of services and media to authorized users. Authorized users can choose their

services through different channels: Web Customer Portal, IVR (Interactive Voice Response), Call Centre

and SMS. The system uses a Smart Card to receive and decrypt the broadcasted encrypted control words

which allow decrypting pay-per-view TV. Every authorized user must have a Smart Card and a Set-Top Box

to view the contents.

The following is an excerpt from the product risk analysis document:

Both likelihood and impact have been rated on the following scale: (1 – Very low, 2 – Low, 3 – Medium, 4 –

High, 5 – Very High).

The required test environment and code have been delivered. All test cases for each identified product risk

item have been written and are ready to be executed. The Database used to contain the Smart Cards is

empty and so only new Smart Cards can be used during test execution.

A Smart Card can only be activated if it has been previously pre-activated. This means the post-conditions

for the execution of the test cases to test the pre-activation of the Smart Card are the pre-conditions for

activation of the Smart Card.

Which of the following statements represents the most effective contribution of the stakeholders to the

completion of the failure mode analysis table?

Options :

A : The aircraft pilot and the customer representative should contribute to assess the detection. The chief software engineer, the system architect and the expert tester should contribute to assess the priority.

B : The aircraft pilot and the customer representative should contribute to assess the priority. The chief software engineer, the system architect and the expert tester should contribute to assess the detection.

C : The system architect and the chief software engineer should contribute to assess the priority. The expert tester is the only one who should contribute to assess the detection.

D : The aircraft pilot is the only one qualified to contribute to assess the priority and thus should be assigned this task. The customer representative should contribute to assess the detection.

Answer: B

Question 3

Which of the following information would you expect to be the most useful to perform a defect clustering analysis?

Options :

A : The trend in the lag time from defect reporting to resolution

B : The defect component information

C : The lifecycle phase in which the defect has been introduced

D : The defect removal efficiency information

Answer: B

Question 4

Which of the following statements describing the consequences of specifying test conditions at a detailed level is NOT true?

Options :

A : In an environment where the test basis is continuously changing, it is recommended to specify test conditions at a detailed level in order to achieve a better maintainability

B : The specification of test conditions at a detailed level can be effective when no formal requirements or other development work products are available

C : The specification of test conditions at a detailed level can require the implementation of an adequate level of formality across the team

D : For system testing, the specification of test conditions at a detailed level, carried out early in the project as soon as the test basis is established, can contribute to defect prevention

Answer: A

Question 5

In the next two months some new features will be constantly added to new releases of a project you are

working on as Test Manager.

You have identified as one of the main project risks, that the requirements specification will still be

incomplete when your team starts the test design and implementation phase.

Some requirements will most likely be completed too late to allow a proper test preparation.

You and your test team have already worked on several similar past projects in the same organization.

Which one of the following options would you expect to be the most effective at mitigating this risk?

Options :

A : Don’t prepare any test and just run the regression test suite to check that the new features don’t introduce regression

B : Make reasonable assumptions about the missing details and design lightweight tests that can be easily updated during test execution

C : Don’t design any test until the test execution starts, then communicate that test execution is blocked due to incomplete requirements

D : Even if there are only few details missing, escalate the risk to the project manager without preparing any tests

Answer: B

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