Spreadsheets... pose a greater threat to your business than almost anything you can imagine.
Howard (2005)
The untested spreadsheet is as dangerous and untrustworthy as an untested program.
Price (2006)
Spreadsheet errors are pervasive, stubborn, ubiquitous and complex.
Irons (2003)
Overconfidence is one of the most substantial causes of spreadsheet errors.
Sakal, et al (2015)
Untested spreadsheets are riddled with errors.
Miller (2005)
Developing an error-free spreadsheet has been a problem since the beginning of end-user computing.
Mireault (2015)
Every study that has looked for errors has found them... in considerable abundance.
Panko & Halverson (1996)
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)
94% of the 88 spreadsheets audited in 7 studies have contained errors.
Panko (2008)
Errors in spreadsheets... result in incorrect decisions being made and significant losses incurred.
Beaman, 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)
Even obvious, elementary errors in very simple, clearly documented spreadsheets are... difficult to find.
Galletta, et al (1993)
Studies have shown that there is a high incidence of errors in spreadsheets.
Csernoch & Biro (2013)
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)
Spreadsheets are alarmingly error-prone to write.
Paine (2001)
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)
Spreadsheets have a notoriously high number of faults.
Rust, et al (2006)
Never assume a spreadsheet is right, even your own.
Raffensperger (2001)
Despite overwhelming and unanimous evidence... companies have continued to ignore spreadsheet error risks.
Panko (2014)
Spreadsheets are extraordinarily and unacceptably prone to error.
Dunn (2010)
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)
Spreadsheets contain errors at an alarmingly high rate.
Abraham, et al (2005)
Spreadsheet shortcomings can significantly hamper an organization's business operation.
Reschenhofer & Matthes (2015)
Spreadsheets are often hard, if not impossible, to understand.
Mireault & Gresham (2015)
...few incidents of spreadsheet errors are made public and these are usually not revealed by choice.
Kruck & Sheetz (2001)
It is now widely accepted that errors in spreadsheets are both common and potentially dangerous.
Nixon & O'Hara (2010)
Errors in spreadsheets are as ubiquitous as spreadsheets themselves.
Colbenz (2005)
Spreadsheets can be viewed as a highly flexible programming environment for end users.
Abreu, et al (2015)
Most large spreadsheets have dozens or even hundreds of errors.
Panko & Ordway (2005)
Spreadsheets are commonly used and commonly flawed.
Caulkins, Morrison, & Weidemann (2008)
60% of large companies feel 'Spreadsheet Hell' describes their reliance on spreadsheets.
Murphy (2007)
A significant proportion of spreadsheets have severe quality problems.
Ayalew (2007)
Spreadsheet development must embrace extensive testing in order to be taken seriously as a profession.
Bock (2016)
Spreadsheets are dangerous to their authors and others.
Durusau & Hunting (2015)
The quality and reliability of spreadsheets is known to be poor.
Bishop & McDaid (2007)
Your spreadsheets may be disasters in the making.
Caulkins, Morrison, & Weidemann (2006)
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)
It is irrational to expect large error-free spreadsheets.
Panko (2013)
1% of all formulas in operational spreadsheets are in error.
Powell, Baker, & Lawson (2009)
Programmers exhibit unwarranted confidence in the correctness of their spreadsheets.
Krishna, et al (2001)
A lot of decisions are being made on the basis of some bad numbers.
Ross (1996)
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)
Despite being staggeringly error prone, spreadsheets are a highly flexible programming environment.
Abreu, et al (2015)

Spreadsheet bibliography

Title Visual checking of spreadsheets
Authors Chen Ying & Hock Chuan Chan
Year 2000
Type Proceedings
Publication EuSpRIG
Series  
Abstract

The difference between surface and deep structures of a spreadsheet is a major cause of difficulty in checking spreadsheets.

After a brief survey of current methods of checking (or debugging) spreadsheets, new visual methods of showing the deep structures are presented.

Illustrations are given on how these visual methods can be employed in various interactive local and global debugging strategies.

Full version Available
Sample
The structures of a spreadsheet
The structures of a spreadsheet

The main difficulty that users have in understanding spreadsheets is the difficulty of establishing cell connections - how each cell depends on other cells. These connections form a structure. The usual tabular layouts for texts and numbers do not show the actual connections. They may even suggest a wrong structure.

The two types of cell structure are:

  • Visual/surface structure. Naturally, users deduce the spreadsheet structure through relative positions of cells as they visually cluster them together. The spreadsheet structure is obtained through the visual scanning of cells.
  • Computational/deep structure. Spreadsheet calculations are based on the formulae in cells. Cells are connected through formulae that reflects data flows in a spreadsheet.

It is difficult to understand a spreadsheet when the two structures in the spreadsheet are very inconsistent.

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