cp/usth/ICT2.7/P2L1 Requirements Engineering Subtitles/2 - Interview with Jane Cleland-Huang - lang_en_vs5.srt

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As we did for other lessons, before starting this

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lesson on requirements engineering, I want to ask a world

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expert on this topic a few questions. I'm here with

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Jane Cleland-Huang, a professor at the DePaul University. And Jane

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is a world expert in the area of requirements

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engineering, which is the theme of this lesson. So I'm

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talking to Jane who is currently in Chicago and I

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want to. Ask her a few questions about requirements engineering.

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So hi Jane how are you?

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>> Fine. Thank you Alex.

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>> And thank you so much for agreeing to

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be interviewed for our course, I'm sure the students

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will really benefit from this. And let me start

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with the first question which is what are software requirements?

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>> That's an interesting question. And software requirements

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basically provide us a description of what a

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system has to do. So, typically they describe

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the functionality of the features. That the system has

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to deliver in order to satisfy its stakeholders.

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And we usually talk about the requirement specification

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in terms of what the system's going to

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do. And we describe it sometimes formally in

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terms of set of shall statements, that the

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system shall do this or shall do that.

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Or we can use various templates to specify

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both textural requirements. But requirements can also be represented

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informally in, in the form of user stories, or use cases, or more

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formally in the form of state transition diagrams and even in kind of

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formal specifications. Especially for critical parts of safety critical systems.

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>> And another should discuss what the

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requirements are. What is the requirements engineering?

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>> So, that's also an interesting question because if you notice

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it's it's engineering and I'm sure in the

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other parts of the software engineering process that

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you're discussing in your course. Parts such as

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testing or coding. They don't have the word engineering

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there and I think one of the reasons

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requirements engineering has that term is because it covers

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a number of different activities. So it includes

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things such as working with stakeholders to elicit or

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to proactively discover what their requirements of the

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system are. Analyzing those requirements so that we

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understand the tradeoffs. So you might have different

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stakeholders that care about different things, and it

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might not be possible to deliver all of those things, so we have to analyze the

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feasibility of the requirements, explore the tradeoffs, emerge

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conflicts. And then of course the specification part,

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which we talked about a little bit already,

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and the validation, so did we in fact get

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the requirements right? Did we build a system

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that actually matches our, our requirements. And then on

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into the requirements management process. And the requirements

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management process. Kind of like goes through things like

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change management. So what if customer or stakeholders

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need the system to change? How do we manage

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changing requirements? And I think this is one of

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the reasons that we've coined the term engineering because

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that it's, has to be a systematic process which

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extends across. The whole of this is life cycle.

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>> And I guess my last question here is

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so now that we heard about software requirements and

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about software requirements engineering, why is requirements engineering so

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important? So what happens if we don't do it right?

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>> Well, I'm sure that, you know,

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many people have probably read the kind of

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report like Spanish report, and other reports of failed

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project, and things like that, and are aware that

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one of the major reasons for projects failing

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is because we didn't get the requirements right

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in the first place. So if we don't understand

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the requirements then we're simply going to build the

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wrong system. Getting requirements right includes all sorts of

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things such as finding the right group of stakeholders so we don't exclude major

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groups of stakeholders. Understanding the requirements correctly.

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There will be many, many different examples of

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projects that have failed. For example, in

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America the healthcare.gov failure, and while we cannot

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put the blame squarely in the area

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of requirements, because obviously the project was challenged

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for a number of different reasons. But

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clearly it underperformed in many respects related to

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security, performance, and reliability and these are all

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parts of the requirements process. Things that should

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have been discovered and the system should have

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been built in order to meet those requirements,

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getting the requirements right in the first place.

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Puts us, a project on the right foot.

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And so that gives us a much better chance

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of delivering to the customer what they need. And

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designing a solution that really meets those requirements. So,

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it's a critical part of the overall software engineering success.

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>> Okay. So that's critical. I mean, we better get our requirements right.

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>> Yeah.

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>> That's, that's the message.

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>> Yeah.

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>> Okay. Well, thank you so much Jane, for taking

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the time off your busy schedule to speak with us.

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I'm sure. The students really appreciate this, and we'll talk to you soon.

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>> Bye Alex, thank you.

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>> Bye, Jane, bye bye. Jane gave

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us an interesting perspective on requirements engineering

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and its importance. Let's now start our

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lesson with a general definition of requirements engineering.