Murphy (2007)60% of large companies feel 'Spreadsheet Hell' describes their reliance on spreadsheets.
Panko (1999)Every study, without exception, has found error rates much higher than organizations would wish to tolerate.
Panko (2008)94% of the 88 spreadsheets audited in 7 studies have contained errors.
Chen & Chan (2000)Spreadsheets are easy to use and very hard to check.
Teo & Tan (1999)Most executives do not really check or verify the accuracy or validity of [their] spreadsheets...
Beaman, et al (2005)Errors in spreadsheets... result in incorrect decisions being made and significant losses incurred.
Galletta, et al (1993)Even obvious, elementary errors in very simple, clearly documented spreadsheets are... difficult to find.
Panko (2013)It is irrational to expect large error-free spreadsheets.
Caulkins, Morrison, & Weidemann (2008)Spreadsheets are commonly used and commonly flawed.
Panko & Halverson (1996)Every study that has looked for errors has found them... in considerable abundance.
Mireault (2015)Developing an error-free spreadsheet has been a problem since the beginning of end-user computing.
Ayalew (2007)A significant proportion of spreadsheets have severe quality problems.
Abraham & Erwig (2007)Spreadsheet errors have resulted in huge financial losses.
Caulkins, Morrison, & Weidemann (2006)Your spreadsheets may be disasters in the making.
Hermans & van der Storm (2015)Spreadsheets are the most popular live programming environments, but they are also notoriously fault-prone.
Abraham, et al (2005)Spreadsheets contain errors at an alarmingly high rate.
Abreu, et al (2015)Despite being staggeringly error prone, spreadsheets are a highly flexible programming environment.
Bishop & McDaid (2007)The quality and reliability of spreadsheets is known to be poor.
Panko & Ordway (2005)Most large spreadsheets have dozens or even hundreds of errors.
Csernoch & Biro (2013)Studies have shown that there is a high incidence of errors in spreadsheets.
Price (2006)The untested spreadsheet is as dangerous and untrustworthy as an untested program.
Nixon & O'Hara (2010)It is now widely accepted that errors in spreadsheets are both common and potentially dangerous.
Bock (2016)Spreadsheet development must embrace extensive testing in order to be taken seriously as a profession.
Howard (2005)Spreadsheets... pose a greater threat to your business than almost anything you can imagine.
Mireault & Gresham (2015)Spreadsheets are often hard, if not impossible, to understand.
Panko (2015)Research on spreadsheet errors is substantial, compelling, and unanimous.
Irons (2003)Spreadsheet errors are pervasive, stubborn, ubiquitous and complex.
Kruck & Sheetz (2001)...few incidents of spreadsheet errors are made public and these are usually not revealed by choice.
Sajaniemi (1998)The results given by spreadsheets are often just wrong.
Miller (2005)Untested spreadsheets are riddled with errors.
Caulkins, Morrison, & Weidemann (2006)People tend to believe their spreadsheets are more accurate than they really are.
Burnett & Myers (2014)The software that end users are creating... is riddled with errors.
Kulesz & Ostberg (2013)Spreadsheets are more fault-prone than other software.
Durusau & Hunting (2015)Spreadsheets are dangerous to their authors and others.
Abreu, et al (2015)Spreadsheets can be viewed as a highly flexible programming environment for end users.
Powell, Baker, & Lawson (2009)1% of all formulas in operational spreadsheets are in error.
Chadwick (2002)Spreadsheet errors... a great, often unrecognised, risk to corporate decision making & financial integrity.
Cunha, et al (2011)Spreadsheets are notoriously error-prone.
Paine (2001)Spreadsheets are alarmingly error-prone to write.
Dunn (2010)Spreadsheets are extraordinarily and unacceptably prone to error.
Krishna, et al (2001)Programmers exhibit unwarranted confidence in the correctness of their spreadsheets.
Panko (2014)Despite overwhelming and unanimous evidence... companies have continued to ignore spreadsheet error risks.
Raffensperger (2001)Never assume a spreadsheet is right, even your own.
Ross (1996)A lot of decisions are being made on the basis of some bad numbers.
Sakal, et al (2015)Overconfidence is one of the most substantial causes of spreadsheet errors.
Rust, et al (2006)Spreadsheets have a notoriously high number of faults.
Reschenhofer & Matthes (2015)Spreadsheet shortcomings can significantly hamper an organization's business operation.
Panko (2007)The issue is not whether there is an error but how many errors there are and how serious they are.
Nixon & O'Hara (2010)Spreadsheet errors are still the rule rather than the exception.
Colbenz (2005)Errors in spreadsheets are as ubiquitous as spreadsheets themselves.
This is an occasional blog about spreadsheet best practice, spreadsheet errors, and testing of spreadsheets.
Spreadsheets are riddled with errors. To reduce the risks our practices must improve.
The objectives of this presentation are to:
We provide guidance based on:
Read more: Making better spreadsheets
People are remarkably accurate when doing a wide range of activities, including working with spreadsheets. Even so, the bottom line result of every spreadsheet is almost certainly wrong.
For example, if you have a spreadsheet consisting of 100 used cells and a moderate 3% probability that each cell contains an error, then the probability that the spreadsheet's results are wrong is 95%.
This article explores how and why the cascading structure of spreadsheets leads to a high error rate, and then we consider what we can do about it.
An important aspect of a spreadsheet's fitness-for-purpose is ensuring that its run time is acceptable to the users. Creating an inefficient spreadsheet is easy, while creating an efficient spreadsheet requires a bit more thought and the application of some techniques to reduce run time.
This article presents an example of using refactoring techniques to vastly improve the run time of a spreadsheet. We focus on an especially slow feature of Excel: the interaction between VBA and the worksheets.Read more: Improving spreadsheet run time
FizzBuzz is a simple word game that is sometimes used as a test for programmers. Here we use FizzBuzz to illustrate the importance of documenting your spreadsheet.
Summary of key points:
Incorrect use of Excel's NPV function is a common source of spreadsheet errors. This article discusses several pitfalls and suggests ways to avoid them.
Summary of key points:
Read more: Pitfalls of Excel's NPV function
In this article we describe how spreadsheets are riddled with errors, drawing on our own experience and on the research presented in the academic literature on spreadsheet errors and testing.
Around 95% of all spreadsheets contain errors. So, unless you've been extremely diligent, or perhaps just very lucky, then it is almost certain that your spreadsheets are wrong.
The spreadsheets that you rely on – to inform decision making, do reporting, and generally conduct analysis of just about everything – are probably giving you incorrect results.
Read more: Your spreadsheets are wrong
In this series of articles we introduce the iⁿ methodology for testing spreadsheets.
The iⁿ 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 iⁿ methodology consists of five components:
Read more: iⁿ spreadsheet testing methodology