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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

<concept id="GUID-6690CEFF-AE08-4881-AF52-70C097EB2871" xml:lang="en"><title>Unavailable

items</title><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>Situations often occur where a certain function cannot be used. In these

cases, the corresponding items in the Options menu must either be hidden,

or there must be an error message given when the user tries to access a function

that cannot be accomplished. The Symbian user interface does

not use dimming of menu items.</p>

<p>This is a trade-off issue: removing unnecessary options makes the Options

menus shorter, but at the same time it changes the menu from situation to

situation, preventing users from learning the function locations. It may even

cause frustration if the users expect some function to be found in the menu,

but it is sometimes not there.</p>

<ul>

<li><p>In case the user has no reason to search for a certain function in

the given situation, it should be hidden. As an extreme example, the Delete

option is not needed when there are no items to be deleted. </p></li>

<li><p>If the user searches for a function, even though it cannot be used

in the current situation, it is often better to display the option and give

an appropriate message if the user tries to access that function.</p><p><ul>

<li><p>An example of this is Digital Rights Management (DRM) protected files:

for example, sending commands shall be visible in the user interface although

sending such a file would not be allowed. Appropriate DRM-specific notifications

are displayed if the user attempts to select one of the options that the user

is not allowed to perform on DRM-protected media objects. This is to facilitate

end-user's learning of the DRM concept.</p></li>

</ul></p></li>

</ul>

</conbody></concept>