Gantt chart - wikipedia Gantt chart `` Gantt '' redirects here. For other uses, see Gantt ( disambiguation ). A Gantt chart showing three kinds of schedule dependencies ( in red ) and percent complete indications. A Gantt chart is a type of bar chart that illustrates a project schedule. Gantt charts illustrate the start and finish dates of the terminal elements and summary elements of a project. Terminal elements and summary elements comprise the work breakdown structure of the project. Modern Gantt charts also show the dependency ( i.e., precedence network ) relationships between activities. Gantt charts can be used to show current schedule status using percent - complete shadings and a vertical `` TODAY '' line as shown here. Although now regarded as a common charting technique, Gantt charts were considered revolutionary when first introduced. This chart is also used in information technology to represent data that has been collected. Contents 1 Historical development 2 Example 3 Gantt chart baseline 4 Gantt chart timeline 5 Further applications 6 See also 7 Citations 8 References 9 Further reading 10 External links Historical development The first known tool of this type was developed in 1896 by Karol Adamiecki, who called it a harmonogram. Adamiecki did not publish his chart until 1931, however, and only in Polish, which limited both its adoption and recognition of his authorship. The chart is named after Henry Gantt ( 1861 -- 1919 ), who designed his chart around the years 1910 -- 1915. One of the first major applications of Gantt charts was by the United States during World War I, at the instigation of General William Crozier. In the 1980s, personal computers allowed widespread creation of complex and elaborate Gantt charts. The first desktop applications were intended mainly for project managers and project schedulers. With the advent of the Internet and increased collaboration over networks at the end of the 1990s, Gantt charts became a common feature of web - based applications, including collaborative groupware. Example In the following table there are seven tasks, labeled a through g. Some tasks can be done concurrently ( a and b ) while others can not be done until their predecessor task is complete ( c and d can not begin until a is complete ). Additionally, each task has three time estimates : the optimistic time estimate ( O ), the most likely or normal time estimate ( M ), and the pessimistic time estimate ( P ). The expected time ( T ) is estimated using the beta probability distribution for the time estimates, using the formula ( O + 4M + P ) ÷ 6. Activity Predecessor Time estimates Opt. ( O ) Normal ( M ) Pess. ( P ) -- 6 4.00 -- 5 9 5.33 5 7 5.17 d 6 10 6.33 b, c 5 7 5.17 f d 8 4.50 g 5 8 5.17 Once this step is complete, one can draw a Gantt chart or a network diagram. A Gantt chart created using Microsoft Project ( MSP ). Note ( 1 ) the critical path is in red, ( 2 ) the slack is the black lines connected to non-critical activities, ( 3 ) since Saturday and Sunday are not work days and are thus excluded from the schedule, some bars on the Gantt chart are longer if they cut through a weekend. Gantt chart baseline Baseline in Gantt chart is used for clear comparison picture of what and how was planned and the current state of a project. Thus a manager or anyone who manages a project is able to see whether a schedule deviates from the initial plan. A project will be successfully accomplished when everything goes according to a baseline. A baseline gives a manager possibility to understand and track project progress and forecast project results. Generally, baselines are a combination of project scope, cost and schedule ( time ) that are called triple constraints of a project. Thanks to baselines a project manager knows what exactly goes wrong and how much it takes. They help to realize problematic points and minimize them. Gantt chart timeline A timeline is an order of events or actions placed along a bar where time periods are labeled. It is a good way to visualize all tasks and events that have start and end dates. A Gantt chart is one of the easiest and most popular ways to visualize events along a timeline. It clearly shows which tasks are already finished, which ones are in progress or lay ahead. Timelines also show tasks dependencies and any delays in a project. To make a timeline in a Gantt chart, one needs to know all tasks, dependencies, durations, and deadlines. Further applications Gantt charts can be used for scheduling generic resources as well as project management. They can also be used for scheduling production processes and employee rostering. In the latter context, they may also be known as timebar schedules. Gantt charts can be used to track shifts or tasks and also vacations or other types of out - of - office time. Specialized employee scheduling software may output schedules as a Gantt chart, or they may be created through popular desktop publishing software. See also Critical path method Float ( project management ) Henry Gantt List of project management software, which includes specific Gantt Chart software. Program evaluation and review technique ( PERT ) Citations Jump up ^ Wilson 2003. Jump up ^ `` The Harmonogram of Karol Adamiecki -- Tags : ADAMIECKI, Karol ORGANIZATION charts ''. Connection.ebscohost.com. Retrieved 4 June 2014. Jump up ^ Gantt 1910. Jump up ^ Morris 1997, p. 7. Jump up ^ Clark 1922. Jump up ^ Triant G. Flouris ; Dennis Lock ( 2009 ). Managing Aviation Projects from Concept to Completion. Ashgate Publishing, Ltd. pp. 207 --. ISBN 978 - 0 - 7546 - 7615 - 7. Jump up ^ `` Availability Planning ''. CEITON. Retrieved 4 June 2014. References Clark, Wallace ( 1922 ). The Gantt Chart : A Working Tool of Management. New York, NY : Ronald Press. Gantt, H.L. ( 1910 ). `` Work, Wages and Profit ''. Engineering Magazine. New York. ; republished as Work, Wages and Profits. Easton, Pennsylvania : Hive Publishing Company. 1974. ISBN 0 - 87960 - 048 - 9. Morris, Peter W.G. ( 1997 ) ( 1994 ). The Management of Projects. Thomas Telford. ISBN 978 - 0 - 7277 - 2593 - 6. Wilson, James M. ( 2003 ). `` Gantt charts : A centenary appreciation '' ( PDF ). European Journal of Operational Research. 149 ( 2 ) : 430 -- 437. doi : 10.1016 / S0377 - 2217 ( 02 ) 00769 - 5. Archived from the original ( PDF ) on 26 November 2013. Retrieved 28 July 2013. Further reading Burkhard, Remo Aslak ; Meier, Michael ; Rodgers, Peter ; Smis, Matthias Thomas Jelle ; Stott, Jonathan ( 2005 ). Knowledge visualization : A comparative study between Project Tube Maps and Gantt Charts. 5th International Conference on Knowledge Management. Graz, Austria : University of Kent. Retrieved 17 September 2017. Geraldi, Joana ; Lechter, Thomas ( 2012 ). `` Gantt charts revisited : A critical analysis of its roots and implications to the management of projects today ''. International Journal of Managing Projects in Business. 5 ( 4 ) : 578 -- 594. doi : 10.1108 / 17538371211268889. Kumar, Pankaja Pradeep ( 2005 ). `` Effective use of Gantt chart for managing large scale projects ''. Cost engineering. 47 ( 7 ) : 14 - 21. ISSN 0274 - 9696. Retrieved 17 September 2017. Marsh, Edward R. ( 1975 ). `` The Harmonogram of Karol Adamiecki ''. Academy of Management Journal. 18 ( 2 ) : 358 -- 364. JSTOR 255537. doi : 10.2307 / 255537. Maylor, Harvey ( 2001 ). `` Beyond the Gantt chart : Project management moving on ''. European Management Journal. 19 ( 1 ) : 92 -- 100. doi : 10.1016 / S0263 - 2373 ( 00 ) 00074 - 8. External links Wikimedia Commons has media related to Gantt charts. Look up gantt chart in Wiktionary, the free dictionary. Long - running discussion regarding limitations of the Gantt chart format, and alternatives, on Edward Tufte 's website Retrieved from `` https://en.wikipedia.org/w/index.php?title=Gantt_chart&oldid=804734470 '' Categories : Operations research Planning Project management Hidden categories : Use dmy dates from September 2017 Talk Contents About Wikipedia Afrikaans Azərbaycanca Башҡортса Català Čeština Dansk Deutsch Ελληνικά Español Euskara فارسی Français 한국어 Hrvatski Bahasa Indonesia Italiano עברית ಕನ್ನಡ Kiswahili Nederlands 日本 語 Norsk Occitan Polski Português Русский සිංහල Simple English Slovenščina Српски / srpski Srpskohrvatski / српскохрватски Basa Sunda Suomi Svenska தமிழ் ไทย Türkçe Українська Tiếng Việt 粵語 中文 Edit links This page was last edited on 10 October 2017, at 20 : 34. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. 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Question: what is gantt chart in software project management
Answer: a type of bar chart that illustrates a project schedule