Less Modules, More Extending
2Bits has a great piece of advise when it comes to extending Drupal. A very common trap is just keep on adding more and more modules to achieve the required functionality. That is what makes Drupal great but at the same time, too many modules can have a seriously negative effect on a sites performance.
In many cases it is possible to extend an existing module. 2Bits has a nice example of extending the contact module to handle flagging of nodes, rather then using the flag content module.
Link: Extend existing modules
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I am Blair Wadman and this is where I write about Drupal, PHP, CSS etc
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"It is true that increasing he number of modules ill increase the modularity which in turn will ease the maintenance wok
But as per the basic software engineering concepts increasing the module more than a limit will create problems in terms of cohesion and coupling
"
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