SPIRAL MODEL

Domain	Definition
Computing	Spiral model A software life-cycle model which supposes incremental development, using the waterfall model for each step, with the aim of managing risk. In the spiral model, developers define and implement features in order of decreasing priority. [Barry Boehm, "A Spiral Model of Software Development and Enhancement", ACM SIGSOFT Software Engineering Notes, August 1986]. [Barry Boehm "A Spiral Model of Software Development and Enhancement" IEEE Computer, vol.21, #5, May 1988, pp 61-72]. [Better explanation?] (1997-11-23). Source: The Free On-line Dictionary of Computing.
Source: compiled by the editor from various references; see credits.

Specialty Definition: Spiral model

The spiral model is a software development model combining elements of both design and prototyping-in-stages, so it's a healthy mix of top-down and bottom-up concepts.

The spiral model was defined by Barry Boehm. This model was not the first model to discuss iteration, but it was the first model to explain why the iteration matters. As originally envisioned, the iterations were typically 6 months to 2 years long. This persisted until around 2000.

Each phase starts with a design goal (such as a user interface prototype as an early phase) and ends with the client (which may be internal) reviewing the progress thus far.

Analysis and engineering efforts are applied to each phase of the project, with an eye toward the end goal of the project.

So, for a typical shrink-wrap application, this might mean that you have a rough-cut of user elements (without the pretty graphics) as an operable application, add features in phases, and, at some point, add the final graphics.

Disadvantages

Estimates (budget and schedule) are harder at the outset because some of the analysis isn't done until that stage is going through design.

Advantages

Estimates (budget and schedule) get more realistic as work progresses, because the questions have been raised.
It is more able to cope with the (nearly inevitable) changes that software development generally entails.
Software engineers, who can get restless with protracted design processes, can get their hands in and working on a project earlier.

Language		Translations for "SPIRAL MODEL"; alternative meanings/domain in parentheses.
Danish		spiralmodel (evolutionary model). (various references)

Dutch		spiraalmodel (evolutionary model). (various references)

Finnish		spiraalimalli (evolutionary model). (various references)

French		modèle en spirale. (various references)

German		Spiralmodell (evolutionary model). (various references)

Greek		εξελικτικό μοντέλο (evolutionary model), ελικοειδές μοντέλο (evolutionary model). (various references)

Pig Latin		iralspay odelmay

Portuguese		modelo evolutivo (evolutionary model), modelo evolucionário (evolutionary model), modelo em espiral (evolutionary model). (various references)

Spanish		modelo en espiral (evolutionary model). (various references)
Source: compiled by the editor from various translation references.

Anagrams: SPIRAL MODEL

Scrabble® Enable2K-Verified Anagrams
	Words within the letters "a-d-e-i-l-l-m-o-p-r-s"
	-2 letters: arillodes, impellors, moralised, polarised, spiralled.
	-3 letters: arillode, dalliers, darioles, diallers, diaspore, diplomas, dismaler, earldoms, episomal, impalers, impearls, impellor, impleads, implodes, implored, implores, lempiras, leopards, leporids, malposed, melodias, meropias, misplead, moralise, parodies, parslied, pelorias, perillas, pillared, plasmoid, plimsole, polarise, pollards, premolds, proemial, promised, rampoles, redpolls, sepaloid, slalomed, spadille, spiraled.
	-4 letters: adipose, admires, alipeds, amidols.
	Words containing the letters "a-d-e-i-l-l-m-o-p-r-s"
	+4 letters: polyacrylamides.
Source: compiled by the editor from various references; see credits. SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro.

Expression	Frequency per Day
spiral model software development	4
Source: compiled by the editor from various references; see credits.

SPIRAL MODEL

Specialty Definition: SPIRAL MODEL

Computing

Specialty Definition: Spiral model

Disadvantages

Advantages

See Also

Frequency of Internet Keywords: SPIRAL MODEL

spiral model software development

Modern Translation: SPIRAL MODEL

Danish

Dutch

Finnish

French

German

Greek

Pig Latin

Portuguese

Spanish

Anagrams: SPIRAL MODEL

Scrabble® Enable2K-Verified Anagrams

INDEX