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Spreadsheet Quality

Spreadsheet Design Concepts Series

Poor Cohesion 2

This flow diagram is taken from a large complex critical pricing model, used to analyse billions of dollars

It's a classic update trap, inserting a row or column anywhere will break all sorts of unexpected things. It appears to be 4 vaguely related tables, in which case it probably makes sense to put them on 4 separate sheets. Alternatively they could be stacked or otherwise aligned so any insertion or deletion would have a consistently correct effect on all blocks.

Even ignoring update issues, this is still a difficult sheet to understand. It seems (and is) an almost random collection of tables, and trying to understand the implied connections and dependencies is difficult. To understand any one block you need to understand all the others.

This sheet demonstrates poor coupling because the tables interfere with each other when they could be designed to work together in a clearer way. It also demonstrates poor cohesion because taken as a whole sheet, it just seems to be a collection of unrelated, or only loosely related tables.

 

Upcoming Events:

25 January 2012 - UK Excel Developer Conference - London


Products for sale:

AltFileSearch

Office 2007 FileSearch replacement logo

New information about the missing FileSearch feature in Office 2007 and details of our pragmatic solution (Current price GBP 30.00)


wsUnprotector

worksheet password remover logo

Instant Excel worksheet protection remover and password recovery (Current price GBP 15.00)


Classic Ribbon Tab

classic ribbon for office 2007 logo

Add Excel 97/2000/2002/2003 compatible menu structure to Excel 2007
(Current Price GBP 10.00)


 

Products coming soon:

Link Manager

(Find and control external links in Excel Workbooks)

Due by Q1 2111.

XLAnalyst Pro

(Excel VBA based spreadsheet auditing tool)

Due before the end of 2111.

  ;-)
This page was last reviewed on December 21, 2011

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