09-07 Contents: Eusprig 2009 conference report, Excel 2007 hotfix
ISSN 1649-2374 This issue online at http://www.sysmod.com/praxis/prax0907.htm [Previous] [Index]
|Systems Modelling Ltd.: Managing reality in Information Systems - strategies for success|
IN THIS ISSUE
|1) Spreadsheet risk
Report from Eusprig conference in Paris
Hotfix for vanishing range names bug in Excel 2007
|3) Off topic: LOL
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This month I report on the 2009 Eusprig conference which
featured a back-to-basics approach.
The key to excellence is doing it right first time; and that was the recurring theme in the papers at the tenth annual conference of the European Spreadsheet Risks Interest Group held at ENS Cachan, Paris, on 2-3 July 2009.
Jocelyn Paine www.j-paine.org, Documenting Spreadsheets with Pseudo-Code: Cash-Flow and Loans
His theme was "First document, then Excel". He specifies time based models in plain text pseudocode and his application (Excelsior) generates Excel files. It reminds me of Angus Dunn's concept, see below, and commercial applications like ModelSheet.
Day 1 Keynote: Martin Erwig, OSU, Software Engineering for Spreadsheets: Challenges and Opportunities.
He spoke of type checking, and described research that indicated that combining syntactic label checking with semantic dimension analysis finds even more faults. A real-world tool from RedRover software, a OSU spinoff, features goal-directed debugging. He mentioned Gencel and ClassSheets, tools for the generation of correct spreadsheets, which may be relevant to the work of Jocelyn Paine (above) and Angus Dunn (below).
Day 2 Keynote: Deniz Sumengen, FRC
She spoke of the Technical Standards for Modelling, from the Board of Actuarial Standards of the Financial Reporting Council. They welcome comments on the exposure draft available from
Patrick O’Beirne Systems Modelling, Checks and Controls in Spreadsheets
This talk went back to basics on structure: have cross-foot totals, SUMs that are safe for the insertion or deletion of data rows, self-checking formulas, and ended with the top ten questions on spreadsheet use.
Susan Allen, HBOS, Excel Modelling, Transparency, Auditing and Business Use
Susan reported on how HBOS went from a restricted modelling package to an Excel-based system because the users preferred it. It features a separation between input, processing, and output; a formula walker to help understand dependencies; and change logging.
Tom Grossman, Ozgur Ozluk & Jan Gustavson University of San Francisco, The Lookup Technique to Replace Nested-If Formulas
This described how to replace successive IF functions, all doing the same kind of test, with a VLOOKUP formula. It received the highest rating from the delegates.
Leslie Bradley & Kevin McDaid Dundalk Institute of Technology, Error Estimation in Large Spreadsheets using Bayesian Statistics
This also drew on Software Engineering experience for defect estimation techniques. Briefly, when you have a very large spreadsheet to audit, you can estimate the number of defects there might be based on how many you found so far. That way you might be able to stop the check earlier either because it looks very good or because it’s too bad to be worth continuing.
Angus Dunn, There will be a better way …
Angus has a generator called RingtailXL for Excel project models. Components are specified using syntax similar to range names, documentation is included, versions and changes are tracked, and can be assembled into workbooks.
John Hunt Excel for managers, An approach for the automated risk assessment of structural differences
He described how DiffXL infers the nature of changes in block structure in order to estimate the riskiness of a change. For example, a simple move of a block would be low risk, formula changes could be high risk.
Matthew Dinmore, University of Maryland Baltimore, Documenting Problem-Solving Knowledge: Proposed Annotation Design
He described implicit, explicit, and literate notation. Implicit notation is inferred from the formulas; explicit is present in comments and textboxes; and literate programming focuses on the best way to describe the program rather than on its executable path. He presented an informed-explicit design consisting of a traditional multi-tabbed spreadsheet pane positioned next to a multi-tabbed document pane.
Ruth McKeever, Kevin McDaid & Brian Bishop Dundalk Institute of Technology , Analysis of the Impact of Named Ranges on the Debugging Performance of Novice Users
This won the Student Prize this year. The international panel of judges, including Martin Erwig of OSU, described it as a well-designed and thoroughly executed piece of research. This directly challenged the common advice to use range names. The results show that for novice debuggers "A spreadsheet that contains range names in formulas will be more difficult to inspect and correct than a spreadsheet that does not use names in formulas".
Bill Bekenn & Ray Hooper Fairway Associates, Some Spreadsheet Poka-Yoke
Poka-Yoke is a Japanese term meaning “Mistake avoidance”. They gave advice with examples on why things fail when inserting, deleting, and copying structural elements, and how to design to avoid these common mistakes.
Angela Collins BDO Stoy Hayward , Embedded spreadsheet modelling
She is the BDO spreadsheet guru who provides on-the-job training; just in time; task oriented. It reminds me of Kath McGuire's talk from 2007,that training based on the tasks that people need to accomplish in their context is more effective than generic classroom-type training. She supported that by reporting on a survey of user satisfaction.
Derek Flood, Kevin Mc Daid, Fergal McCaffery. Dundalk Institute of Technology , NLP-SIR: A Natural Language Approach for SS Information Retrieval
This allows the user to type enquiries in ordinary English in order to query tables contained in a spreadsheet. Such techniques are available in database queries. It reminded Grenville Croll of the Lotus 123 addin called "HAL".
Sriram Iyengar & John Shvirbely Medal.org and University of Texas , The Medical Algorithms Project
He described this huge corpus of 11,000 spreadsheets that facilitate medical decision making. However there were no details of the quality check and control techniques that they exercised.
Françoise Tort, François-Marie Blondel, Éric Bruillard ENS Cachan , From errors detection to behaviour observation: first results
The paper described using Camtasia to capture actions by users examining a spreadsheet for defects, and later analysis. Two groups were used, Sciences and Social Sciences. Martin Erwig asked about the gender differences in the groups which might be an explanation of the different behaviours. They also presented their results of an experiment carried out at Eusprig with a digital pen, to learn how to capture timing of form filling.
Étienne Vandeput Université de Liège, Belgium , Milestones for Teaching the Spreadsheet Program
He described the common limitations in most spreadsheet training books and school courses – that they focus on the commands in the spreadsheet, not problem solving. This accords with the view of Angela Collins above. He is developing a corpus of problem-based learning examples.
Grenville Croll Spreadsheet Engineering Ltd , Spreadsheets and the Financial Collapse
He comprehensively outlined the risks: human error, fraud, overconfidence, interpretation, archiving, assumptions, opacity, reification, and enterprise inoperability. And the role of spreadsheets in the financial system: Ubiqity, Importance, Criticality, Legality, Centrality, Contagion. He pointed to statements from the UK Financial regulator indicating their knowledge of the risks in spreadsheets found in use. A possible lesson might be drawn from the collapse of the Jamaican banking system from over-reliance on uncontrolled personal spreadsheets. He was careful to avoid asserting causation - certainly all these CDOs could not have been developed and piggybacked into a dizzyingly unstable pyramid without spreadsheets. But the reason surely is greed; "don't look too closely as these things as long as they are making us money".
Mel Glass EASA, Reducing the Risk of Spreadsheet Usage - A Case Study
He gave a straightforward description a method to web-enable a spreadsheet that gives full access to its features (eg VBA) which is more than what Excel Services does.
Last month I mentioned the problem of Excel 2007 unpredictably losing defined names.
Jan Karel Pieterse posted to the Daily Dose of Excel blog that MS have a hotfix:
Make sure you have Office 2007 updated to at least SP1; visit
Microsoft Update to check if you need it.
After that, visit the hotfix page and request your hotfix download:
ScanXLS scans any given directory and below and obtains a list of all the .XL* files. You then select some or all of these, and it opens each one in turn read-only and reports on some file properties, attributes, the presence of unusual features or settings that may represent a risk or are prone to human error, the error checking statistics provided by Microsoft Excel, a list of other workbooks that it depends on through links, and a scoring on how 'problematic' it might be. SCANXLS can also compare two workbooks to check whether their formulas and/or values are identical.
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Thank you! Patrick O'Beirne, Editor
including Safety Graphic Fun poking fun at the signs that are supposed to help us stay safe:
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