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

Spreadsheet bibliography

Title Modeling spreadsheet audit: A rigorous approach to automatic visualization
Authors Jorma Sajaniemi
Year 1998
Type Article
Publication Journal of Visual Languages & Computing
Series Volume 11, Number 1, February, pages 49-82
Abstract

Computations in spreadsheets are hard to grasp and consequently many errors remain unnoticed. The problem with the hidden errors lies in the invisibility of the structure of calculations. As a result, auditing and visualization tools are required to make spreadsheets easier to comprehend and errors easier to be detected.

This paper presents a theoretical model of spreadsheets, and describes various spreadsheet auditing mechanisms employing the model. Moreover, two new visualization mechanisms are introduced.

The model reflects not only current spreadsheet systems but also the way people actually use spreadsheets. Theoretically, it is impossible to check the correctness of a spreadsheet without a formal definition of its computations, but our hope is to find visualizations that point out parts of spreadsheets that contain anomalies, i.e., potential locations of errors. The model helps us to understand how such anomalies can be defined.

Full version Available
Sample
Spreadsheet data flow visualization
Spreadsheet data flow visualization

We have developed a visualization that highlights the data flow of a spreadsheet as well as areas containing formulae or data that seems to form a logical entity.

This visualization marks with yellow coloring and a thick border areas (so called S areas) that contain values having equal type and equal format as well as areas having a formula that could be obtained by copying from each other.

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