Worst practices (things to avoid at all costs)

I have read the paper that describes best practices when developing with ApEx.
However, I also happen to think that there is something to learn from bad practices and other "don't"s.
What are the worst design mistakes you have ever seen and would like to point out as pitfalls?

Hi,
1 To extend what Vikas2 has said: Don't try to recreate something created in ANY other application as it appears in that application.
2 Do not try to create an entire application on one page
3 Do not overuse conditions - if there are dozens of conditionally displayed regions and/or items on the page, then you probably should be using several pages instead
4 Don't forget to apply Authorization Schemes to pages when you have applied them to tabs - the user can still get to a page by changing the url
5 Don't ignore users who can not/will not use the mouse - make sure you can tab to everything and press Enter where required
6 Don't overload your page with graphics - this adds to load time as well as hiding the functionality of the page
7 Don't have too many fonts/styles on your pages - stick to one font if possible and use the same style for the same reason on all pages
8 Don't have ANY automatic popups on your pages
9 Don't forget to provide help - either on-screen or as a downloadable doc
10 Don't forget to Protect applications items and page items that you don't want users to be able to change
11 Don't use different Edit etc icons throughout an application - be consistent so that users know what to look for
12 Don't forget to validate data - use javascript AND Apex validations where possible
13 Don't forget to test your application in different browsers
14 Don't attempt to edit a template to try to handle multiple requirements - create one for each
15 Don't recreate the same code in different pages - create procedures, functions, packages etc and use those
16 Don't forget that data can be added into the tables from ANY source, so don't rely on processes and computations on a page to finalise data - use triggers etc
17 Don't enter repeating data on a table - use foreign keys to a lookup table
18 Don't forget to add indexes to tables - especially for columns in reports that are sortable and for those used in joins for SQL statements
Andy

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Worst practices (things to avoid at all costs)

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