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

i spreadsheet testing methodology

In this series of articles we introduce the i methodology for testing spreadsheets.

The i spreadsheet testing methodology is a set of guidelines for validating that a spreadsheet does what it is intended to do and ensuring that it will continue to do so.

The i methodology consists of five components:

  • Intent.
  • Instructions.
  • Instruments.
  • Implementation.
  • Immunity.

Read more: i spreadsheet testing methodology

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