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To restrict the types of solutions you might include these performance constraints:

  • It must take a load of at least one ton.
  • The load area must be covered.
  • The load area must have a height of at least 10 feet.

Similarly, for the computer system example ( [link] ), you might specify values for the generic types of performance constraints:

  • The response time for information to appear to a user.
  • The number of hours a system should be available.
  • The number of records a system should be able to hold.
  • The capacity for growth of the system.
  • The length of time a record should be held for auditing purposes.

For the customer records example these might be:

  • The system should be available from 9 AM to 5 PM Monday to Friday.
  • The system should be able to hold 100,000 customer records initially.
  • The system should be able to add 10,000 records a year for 10 years.
  • A record should be fully available on the system for at least 7 years.

The important point with these examples is that they restrict the number of solution options that are offered to you by the developer. In addition to the performance constraints you may include some development constraints.

There are three general types of development constraints:

  • Time : When a deliverable should be delivered
  • Resource : How much money is available to develop the deliverable
  • Quality : Any standards that are used to develop the deliverable, and develop methods, etc.

Technical requirements

Technical requirements emerge from the functional requirements, they answer the question, and how will the problem be solved this time; will it be solved technologically and/or procedurally. They answer how the system needs to be designed and implemented to provide required functionality and fulfill required operational characteristics. For example, in a software project, the functional requirements may stipulate that a data base system will be developed to allow access to financial data through a remote terminal; the corresponding technical requirements would spell out the architecture of the data structure, the language in which the database management system will be written, the hardware on which the system will run, telecommunication protocols that should be used and so forth.

User requirements

User requirements are what the users need to do with the system or product. They focus on the experience users need to have with the system, they can also reflect how the product will be designed, and define how test cases must be formulated.

Business requirements

Business requirements are the needs of the sponsoring organization, always from a management perspective. Business requirements are statements of the business rationale for the project. They are usually expressed in broad outcomes the business requires, rather than specific functions the system may perform. These requirements grow out of the vision for the product that, in turn, is driven by mission (or business) goals and objectives.

Regulatory requirements

Regulatory requirements can be internal or external and are usually non-negotiable. They are the restrictions, licenses and laws applicable to a product or business, imposed by the government.

Questions & Answers

what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
yes that's correct
I think
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Project management. OpenStax CNX. Aug 05, 2016 Download for free at http://legacy.cnx.org/content/col11120/1.10
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