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

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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