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| pages=79–93}}</ref>
Currently the term "effort estimate" is used to denote as different concepts such as most likely use of effort (modal value), the effort that corresponds to a probability of 50% of not exceeding (median), the planned effort, the budgeted effort or the effort used to propose a bid or price to the client. This is believed to be unfortunate, because communication problems may occur and because the concepts serve different goals.<ref>{{cite journal | last1 = Edwards | first1 = J.S. Moores | year = 1994 | title = A conflict between the use of estimating and planning tools in the management of information systems | journal = [[European Journal of Information Systems]] | volume = 3 | issue = 2| pages = 139–147 | doi=10.1057/ejis.1994.14| s2cid = 62582672 }}</ref><ref>Goodwin, P. (1998). Enhancing judgmental sales forecasting: The role of laboratory research. Forecasting with judgment. G. Wright and P. Goodwin. New York, John Wiley & Sons: 91-112. Hi
==History==
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| doi = 10.1109/32.965341
| year = 2001
| bibcode = 2001ITSEn..27.1014S
| url = http://bura.brunel.ac.uk/handle/2438/1102 }}
</ref> This implies that different organizations benefit from different estimation approaches. Findings<ref name="Jørgensen, M">{{cite web
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| url = http://portal.acm.org/citation.cfm?id=951936 | doi = 10.1109/TSE.2003.1245300
| year = 2003
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| citeseerx = 10.1.1.101.5792
}}
</ref> and there are several alternative measures, such as more symmetric measures,<ref>{{cite journal
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