Never assume a spreadsheet is right, even your own.
Raffensperger (2001)
The results given by spreadsheets are often just wrong.
Sajaniemi (1998)
Even obvious, elementary errors in very simple, clearly documented spreadsheets are... difficult to find.
Galletta, et al (1993)
Research on spreadsheet errors is substantial, compelling, and unanimous.
Panko (2015)
94% of the 88 spreadsheets audited in 7 studies have contained errors.
Panko (2008)
Most executives do not really check or verify the accuracy or validity of [their] spreadsheets...
Teo & Tan (1999)
Spreadsheets are extraordinarily and unacceptably prone to error.
Dunn (2010)
A significant proportion of spreadsheets have severe quality problems.
Ayalew (2007)
60% of large companies feel 'Spreadsheet Hell' describes their reliance on spreadsheets.
Murphy (2007)
Spreadsheets are alarmingly error-prone to write.
Paine (2001)
Spreadsheets can be viewed as a highly flexible programming environment for end users.
Abreu, et al (2015)
Spreadsheet development must embrace extensive testing in order to be taken seriously as a profession.
Bock (2016)
Spreadsheet errors... a great, often unrecognised, risk to corporate decision making & financial integrity.
Chadwick (2002)
A lot of decisions are being made on the basis of some bad numbers.
Ross (1996)
Spreadsheets... pose a greater threat to your business than almost anything you can imagine.
Howard (2005)
Spreadsheets are commonly used and commonly flawed.
Caulkins, Morrison, & Weidemann (2008)
Your spreadsheets may be disasters in the making.
Caulkins, Morrison, & Weidemann (2006)
Untested spreadsheets are riddled with errors.
Miller (2005)
Spreadsheet errors have resulted in huge financial losses.
Abraham & Erwig (2007)
Spreadsheet shortcomings can significantly hamper an organization's business operation.
Reschenhofer & Matthes (2015)
Despite overwhelming and unanimous evidence... companies have continued to ignore spreadsheet error risks.
Panko (2014)
Studies have shown that there is a high incidence of errors in spreadsheets.
Csernoch & Biro (2013)
Spreadsheets are often hard, if not impossible, to understand.
Mireault & Gresham (2015)
Spreadsheet errors are pervasive, stubborn, ubiquitous and complex.
Irons (2003)
Despite being staggeringly error prone, spreadsheets are a highly flexible programming environment.
Abreu, et al (2015)
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 easy to use and very hard to check.
Chen & Chan (2000)
Most large spreadsheets have dozens or even hundreds of errors.
Panko & Ordway (2005)
1% of all formulas in operational spreadsheets are in error.
Powell, Baker, & Lawson (2009)
The issue is not whether there is an error but how many errors there are and how serious they are.
Panko (2007)
The untested spreadsheet is as dangerous and untrustworthy as an untested program.
Price (2006)
Overconfidence is one of the most substantial causes of spreadsheet errors.
Sakal, et al (2015)
Spreadsheet errors are still the rule rather than the exception.
Nixon & O'Hara (2010)
Spreadsheets are dangerous to their authors and others.
Durusau & Hunting (2015)
It is now widely accepted that errors in spreadsheets are both common and potentially dangerous.
Nixon & O'Hara (2010)
Errors in spreadsheets... result in incorrect decisions being made and significant losses incurred.
Beaman, et al (2005)
Programmers exhibit unwarranted confidence in the correctness of their spreadsheets.
Krishna, et al (2001)
Every study that has looked for errors has found them... in considerable abundance.
Panko & Halverson (1996)
Spreadsheets are more fault-prone than other software.
Kulesz & Ostberg (2013)
Spreadsheets have a notoriously high number of faults.
Rust, et al (2006)
Spreadsheets contain errors at an alarmingly high rate.
Abraham, et al (2005)
The quality and reliability of spreadsheets is known to be poor.
Bishop & McDaid (2007)
People tend to believe their spreadsheets are more accurate than they really are.
Caulkins, Morrison, & Weidemann (2006)
Errors in spreadsheets are as ubiquitous as spreadsheets themselves.
Colbenz (2005)
Spreadsheets are the most popular live programming environments, but they are also notoriously fault-prone.
Hermans & van der Storm (2015)
...few incidents of spreadsheet errors are made public and these are usually not revealed by choice.
Kruck & Sheetz (2001)
The software that end users are creating... is riddled with errors.
Burnett & Myers (2014)
Spreadsheets are notoriously error-prone.
Cunha, et al (2011)
It is irrational to expect large error-free spreadsheets.
Panko (2013)

Spreadsheet bibliography

Title A user-centered approach for testing spreadsheets
Authors Yirsaw Ayalew
Year 2007
Type Article
Publication International Journal of Computing and ICT Research
Series Volume 1, Number 1, June, pages 76-84
Abstract

Spreadsheets are a special form of computer program, which are widely used in areas such as accounting, finance, business management, science and engineering. The wide use of spreadsheets can be attributed to the fact that they appeal to end-user programmers because they are easy to use and require no formal training on designing and programming techniques.

However, as the literature indicates, a significant proportion of spreadsheets contain faults. This paper presents an approach for checking spreadsheets on the premises that their developers are not software professionals. It takes inherent characteristics of spreadsheets as well as the conceptual models of spreadsheet programmers into account and incorporates ideas from symbolic testing and interval analysis.

To evaluate the methodology proposed, a prototype-tool preserving the look-and-feel spreadsheets developers are accustomed to has been developed.

Full version Available
Sample
Attaching an interval to a numeric cell
Attaching an interval to a numeric cell

When the user wants to attach an interval to a given cell, the user selects the cell and chooses a command from the Interval menu through which interval-based testing features are available.

The attached interval is then stored in the expected spreadsheet as a string with the same coordinate as the corresponding cell selected in the ordinary spreadsheet.

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