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


Connexion is a collection of the most useful and interesting spreadsheet-related articles from the web.

We review more than 200 websites and blogs to collect the best articles on tools, tips, and techniques that help you to improve your spreadsheets. Each article here is just a snippet - click on the title to open the full article.

Numer of Connexion articles: 217

Two quick ways to troubleshoot broken Excel formulas

Two quick ways to troubleshoot broken Excel formulas

8 May 2017

Excel has built-in tools that are very useful for troubleshooting formulas, even if the formulas are complex:

  • Trace Precedents.
  • Evaluate Formula.

The Evaluate Formula window and the tracer arrows are great tools that can be used to help you find the reason for an error.

How to use form controls in Excel

How to use form controls in Excel

4 May 2017

You can give your worksheets form-like functionality without ever having to use VBA. In order to achieve this, you will have to use form controls.

Using formulas in combination with form controls, one can further extend the form control functionality and form-like appearance of the worksheet at hand.

This article uses a few simple examples to illustrate how to use form controls in Excel.

Excel price lookup for date and product name

Excel price lookup for date and product name

28 April 2017

This article describes several alternative approaches to solving a lookup problem in Excel.

Specifically, the problem is: given an on-going list of invoices, create a lookup formula to find the product price based on the invoice date.

Also have a look at the article's comments, where readers propose additional solutions.

Ultimate guide to data cleaning in Excel

Ultimate guide to data cleaning in Excel

25 April 2017

Data cleaning is one of the necessary excel skills that you are expected to possess today.

A data set might be having certain inconsistencies, and to make it more presentable and to help proper understanding of the data it is necessary to make the data look better and error-free.

This article describes 11 techniques to help you 'clean' data in Excel:

  • Run a spell check.
  • Make the text case consistent.
  • Remove any extra spaces.
  • Clear all formatting, comments, hyperlinks.
  • Treat cells containing errors.
  • Use 'Find and Replace' feature to make data look better.
  • Replace or substitute text.
  • Replace blank cells with '0', 'No Value', 'Nothing', 'Not Available', etc.
  • Treat duplicates.
  • Merging contents of columns.
  • Splitting contents of a column.
Lookup in Excel: Functions and formula examples

Lookup in Excel: Functions and formula examples

20 April 2017

The tutorial explains the basics of Lookup in Excel, shows the strengths and weaknesses of each Excel Lookup function and provides a number of examples to help you decide which lookup formula is best to be used in a particular situation.

The lookup functions discussed are:

  • Lookup.
  • Vlookup.
  • Hlookup.
  • Vlookup Match.
  • Hlookup Match.
  • Offset Match.
  • Offset Match Match.
  • Index Match.
  • Index Match Match.
Retrieve values from many workbooks

Retrieve values from many workbooks

7 April 2017

This article explains how to consolidate data from numerous Excel files using Power Query.

The situation:

  • A folder contains hundreds of Excel files.
  • New workbooks can be added to the folder, or some workbooks can be removed.
  • Workbooks do not contain the same number of worksheets.
  • Worksheets may be added or removed at any time.
  • There is no naming convention for the worksheets.
  • Each worksheet may contain one or more values to retrieve.
  • The data needs to be consolidated often.

The solution: Use Power Query to import and consolidate the data automatically.

How to use Excel Hyperlink function to create different link types

How to use Excel Hyperlink function to create different link types

24 March 2017

This tutorial explains the basics of the Excel HYPERLINK function and provides a few tips and formula examples to use it most efficiently.

Topics include:

  • Excel HYPERLINK function - syntax and basic uses.
  • How to use HYPERLINK in Excel - formula examples.
  • Create hyperlinks to different items.
  • Vlookup and insert a hyperlink to the first match.
  • How to edit multiple Hyperlink formulas at a time.
  • Excel HYPERLINK not working - reasons and solutions.
Excel map charts

Excel map charts

18 March 2017

New in Excel 2016 (for Office 365 subscription users only) are Map Charts.

Excel map charts can display your data encoded by:

  • Values with a 2-color scale.
  • Values with a 3-colour diverging scale.
  • By category.

This article shows some examples of how to create and format Excel map charts.

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