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