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

Powered by:

SearchCompliance

  • risk management

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

  • compliance as a service (CaaS)

    Compliance as a Service (CaaS) is a cloud service service level agreement (SLA) that specified how a managed service provider (...

  • data protection impact assessment (DPIA)

    A data protection impact assessment (DPIA) is a process designed to help organizations determine how data processing systems, ...

SearchSecurity

  • spyware

    Spyware is a type of malicious software -- or malware -- that is installed on a computing device without the end user's knowledge.

  • application whitelisting

    Application whitelisting is the practice of specifying an index of approved software applications or executable files that are ...

  • botnet

    A botnet is a collection of internet-connected devices, which may include PCs, servers, mobile devices and internet of things ...

SearchHealthIT

SearchDisasterRecovery

  • business continuity plan (BCP)

    A business continuity plan (BCP) is a document that consists of the critical information an organization needs to continue ...

  • disaster recovery team

    A disaster recovery team is a group of individuals focused on planning, implementing, maintaining, auditing and testing an ...

  • cloud insurance

    Cloud insurance is any type of financial or data protection obtained by a cloud service provider. 

SearchStorage

  • DRAM (dynamic random access memory)

    Dynamic random access memory (DRAM) is a type of semiconductor memory that is typically used for the data or program code needed ...

  • RAID 10 (RAID 1+0)

    RAID 10, also known as RAID 1+0, is a RAID configuration that combines disk mirroring and disk striping to protect data.

  • PCIe SSD (PCIe solid-state drive)

    A PCIe SSD (PCIe solid-state drive) is a high-speed expansion card that attaches a computer to its peripherals.

Close