Browse Definitions :
Definition

triple constraint

Contributor(s): Ivy Wigmore

The triple constraint is the combination of the three most significant restrictions on any project: scope, schedule and cost.

The triple constraint is sometimes referred to as the project management triangle or the iron triangle. In the typical triangular model, scope, schedule and cost are constraints that form the sides of the triangle, with quality as the central theme. (An alternative to the triangle, the project management diamond, adds quality as the fourth side of the model and changes the central theme to customer expectations.)

The three constraints are interdependent: None of them can be altered without affecting one or both of the others. For example, if the scope of a project is increased, it is likely to take longer and/or cost more. Likewise, an earlier deadline is almost certain to either require more money or a less ambitious scope.

The difficulty of satisfying expectations for all three constraints is sometimes expressed as pick two: the concept that in any set of three desired qualities, only two can be delivered. If, for example, clients want to keep the budget low, the product is likely to take longer or be of lower quality.

An alternative model, STR, defines project scope as the product of time and resources put into it.

See a video explanation of the triple constraint model:

This was last updated in March 2015

Continue Reading About triple constraint

Join the conversation

1 comment

Send me notifications when other members comment.

Please create a username to comment.

I've always thought it was the Cost/Quality/Schedule Triangle.  Interesting.
Cancel

-ADS BY GOOGLE

File Extensions and File Formats

SearchCompliance

  • PCI DSS (Payment Card Industry Data Security Standard)

    The Payment Card Industry Data Security Standard (PCI DSS) is a widely accepted set of policies and procedures intended to ...

  • risk management

    Risk management is the process of identifying, assessing and controlling threats to an organization's capital and earnings.

  • compliance framework

    A compliance framework is a structured set of guidelines that details an organization's processes for maintaining accordance with...

SearchSecurity

  • Trojan horse (computing)

    In computing, a Trojan horse is a program downloaded and installed on a computer that appears harmless, but is, in fact, ...

  • identity theft

    Identity theft, also known as identity fraud, is a crime in which an imposter obtains key pieces of personally identifiable ...

  • DNS over HTTPS (DoH)

    DNS over HTTPS (DoH) is a relatively new protocol that encrypts domain name system traffic by passing DNS queries through a ...

SearchHealthIT

  • telemedicine (telehealth)

    Telemedicine is the remote delivery of healthcare services, such as health assessments or consultations, over the ...

  • Project Nightingale

    Project Nightingale is a controversial partnership between Google and Ascension, the second largest health system in the United ...

  • medical practice management (MPM) software

    Medical practice management (MPM) software is a collection of computerized services used by healthcare professionals and ...

SearchDisasterRecovery

SearchStorage

  • M.2 SSD

    An M.2 SSD is a solid-state drive (SSD) that conforms to a computer industry specification and is used in internally mounted ...

  • kilobyte (KB or Kbyte)

    A kilobyte (KB or Kbyte) is a unit of measurement for computer memory or data storage used by mathematics and computer science ...

  • virtual memory

    Virtual memory is a memory management capability of an operating system (OS) that uses hardware and software to allow a computer ...

Close