Spreadsheet development must embrace extensive testing in order to be taken seriously as a profession.
Bock (2016)
A significant proportion of spreadsheets have severe quality problems.
Ayalew (2007)
Spreadsheet errors... a great, often unrecognised, risk to corporate decision making & financial integrity.
Chadwick (2002)
Even obvious, elementary errors in very simple, clearly documented spreadsheets are... difficult to find.
Galletta, et al (1993)
Spreadsheet shortcomings can significantly hamper an organization's business operation.
Reschenhofer & Matthes (2015)
The issue is not whether there is an error but how many errors there are and how serious they are.
Panko (2007)
Spreadsheets can be viewed as a highly flexible programming environment for end users.
Abreu, et al (2015)
Spreadsheet errors have resulted in huge financial losses.
Abraham & Erwig (2007)
It is irrational to expect large error-free spreadsheets.
Panko (2013)
Spreadsheets... pose a greater threat to your business than almost anything you can imagine.
Howard (2005)
The untested spreadsheet is as dangerous and untrustworthy as an untested program.
Price (2006)
Research on spreadsheet errors is substantial, compelling, and unanimous.
Panko (2015)
Spreadsheets are dangerous to their authors and others.
Durusau & Hunting (2015)
Never assume a spreadsheet is right, even your own.
Raffensperger (2001)
The software that end users are creating... is riddled with errors.
Burnett & Myers (2014)
Despite being staggeringly error prone, spreadsheets are a highly flexible programming environment.
Abreu, et al (2015)
60% of large companies feel 'Spreadsheet Hell' describes their reliance on spreadsheets.
Murphy (2007)
Spreadsheets are commonly used and commonly flawed.
Caulkins, Morrison, & Weidemann (2008)
A lot of decisions are being made on the basis of some bad numbers.
Ross (1996)
It is now widely accepted that errors in spreadsheets are both common and potentially dangerous.
Nixon & O'Hara (2010)
Spreadsheets are easy to use and very hard to check.
Chen & Chan (2000)
Spreadsheets contain errors at an alarmingly high rate.
Abraham, et al (2005)
Your spreadsheets may be disasters in the making.
Caulkins, Morrison, & Weidemann (2006)
Spreadsheet errors are pervasive, stubborn, ubiquitous and complex.
Irons (2003)
...few incidents of spreadsheet errors are made public and these are usually not revealed by choice.
Kruck & Sheetz (2001)
Most executives do not really check or verify the accuracy or validity of [their] spreadsheets...
Teo & Tan (1999)
Spreadsheets are alarmingly error-prone to write.
Paine (2001)
Every study, without exception, has found error rates much higher than organizations would wish to tolerate.
Panko (1999)
Developing an error-free spreadsheet has been a problem since the beginning of end-user computing.
Mireault (2015)
Spreadsheets are often hard, if not impossible, to understand.
Mireault & Gresham (2015)
Most large spreadsheets have dozens or even hundreds of errors.
Panko & Ordway (2005)
Spreadsheets have a notoriously high number of faults.
Rust, et al (2006)
Overconfidence is one of the most substantial causes of spreadsheet errors.
Sakal, et al (2015)
Spreadsheets are the most popular live programming environments, but they are also notoriously fault-prone.
Hermans & van der Storm (2015)
94% of the 88 spreadsheets audited in 7 studies have contained errors.
Panko (2008)
The results given by spreadsheets are often just wrong.
Sajaniemi (1998)
Spreadsheets are more fault-prone than other software.
Kulesz & Ostberg (2013)
Errors in spreadsheets are as ubiquitous as spreadsheets themselves.
Colbenz (2005)
Studies have shown that there is a high incidence of errors in spreadsheets.
Csernoch & Biro (2013)
1% of all formulas in operational spreadsheets are in error.
Powell, Baker, & Lawson (2009)
Spreadsheets are extraordinarily and unacceptably prone to error.
Dunn (2010)
Despite overwhelming and unanimous evidence... companies have continued to ignore spreadsheet error risks.
Panko (2014)
Programmers exhibit unwarranted confidence in the correctness of their spreadsheets.
Krishna, et al (2001)
People tend to believe their spreadsheets are more accurate than they really are.
Caulkins, Morrison, & Weidemann (2006)
Spreadsheet errors are still the rule rather than the exception.
Nixon & O'Hara (2010)
Untested spreadsheets are riddled with errors.
Miller (2005)
Spreadsheets are notoriously error-prone.
Cunha, et al (2011)
Every study that has looked for errors has found them... in considerable abundance.
Panko & Halverson (1996)
Errors in spreadsheets... result in incorrect decisions being made and significant losses incurred.
Beaman, et al (2005)
The quality and reliability of spreadsheets is known to be poor.
Bishop & McDaid (2007)

Spreadsheet bibliography

Title Are we overconfident in our understanding of overconfidence?
Authors Raymond R. Panko
Year 2014
Type Proceedings
Publication First Workshop on Software Engineering Methods in Spreadsheets
Series July
Abstract

In spreadsheet error research, there is a Grand Paradox. Although many studies have looked at spreadsheet errors, and have found, without exception, has error rates that are unacceptable in organizations, organizations continue to ignore spreadsheet risks.

They do not see the need to apply software engineering disciplines long seen to be necessary in software development, in which error types and rates are similar to those in spreadsheet development.

Traditionally, this Great Paradox had been attributed to overconfidence. This paper introduces other possible approaches for understanding the Grand Paradox. It focuses on risk blindness, which is our unawareness of errors when they occur.

Full version Available
Sample
Bat and ball

You are told that a bat and ball cost a dollar and ten cents and that the bat costs a dollar more than the ball.

How much does the ball cost?

A typical response is that the ball costs ten cents. This is wrong, of course.

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