computer science

User requirements document

User requirements document is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand User requirements document rather than just read about it. In short: The user requirement(s) document (URD) or user requirement(s) specification (URS) is a document usually used in software engineering that specifies what the user expects the software to be able to do. Once the required information is completely gathered it is documented in a URD, which is meant to spell out exactly what the software must do and becomes part of the contractual agreement.

Key takeaways

User requirements document belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect User requirements document to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of User requirements document from memory before moving on to harder problems.

Reference excerpt

The user requirement(s) document (URD) or user requirement(s) specification (URS) is a document usually used in software engineering that specifies what the user expects the software to be able to do. Once the required information is completely gathered it is documented in a URD, which is meant to spell out exactly what the software must do and becomes part of the contractual agreement. A customer cannot demand features not in the URD, while the developer cannot claim the product is ready if it does not meet an item of the URD. The URD can be used as a guide for planning cost, timetables, milestones, testing, etc. The explicit nature of the URD allows customers to show it to various stakeholders to make sure all necessary features are described. Formulating a URD requires negotiation to determine what is technically and economically feasible. Preparing a URD is one of those skills that lies between a science and an art, requiring both software technical skills and interpersonal skills.

Pharmaceutical Industry Use User Requirement Specifications (URS) are important in the pharmaceutical industry for regulatory and business purposes. URS support regulatory and business considerations for processes, equipment, and systems. For example, a business consideration could be the foot print of equipment prior to installation to ensure there is enough room. Likewise, a regulatory consideration could be the ability for the system to provide an audit trail to ensure the system meets regulatory requirements.

URS writing pitfalls Commonly, when companies are purchasing systems, processes, and equipment - not everything is considered. URS ensure everything is considered and the supplier provides the components, features, and design required to meet the company needs. By considering more and having the components, features, and design required, the system, process, or equipment can be aligned with company interests and easily integrated.

See also Product requirements document Market requirements document Requirements management Use case

References

External links ISO 25065 "User requirements specification"

Worked examples

Example 1 — a first encounter with User requirements document

Start with the simplest possible case. Write down what User requirements document claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to User requirements document before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about User requirements document ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of User requirements document

In research: User requirements document appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses User requirements document in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: User requirements document is common in secondary-school and first-year university syllabi. It links to neighbouring topics Software engineering stubs, Software requirements, so understanding it makes those chapters shorter.
In everyday life: Look for User requirements document outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study User requirements document in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what User requirements document means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain User requirements document out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is User requirements document in simple terms?

Why does User requirements document matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study User requirements document?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on User requirements document.