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+++ b/Symbian3/SDK/Source/GUID-5486EFD3-4660-4C19-A007-286DE48F6EEF.dita	Wed Mar 31 11:11:55 2010 +0100
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+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"Eclipse Public License v1.0" which accompanies this distribution, 
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+    Nokia Corporation - initial contribution.
+Contributors: 
+-->
+<!DOCTYPE concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-5486EFD3-4660-4C19-A007-286DE48F6EEF" xml:lang="en"><title>Scaling
+and positioning of controls</title><prolog><metadata><keywords/></metadata></prolog><conbody>
+<section id="GUID-EF8CA4BE-130F-4117-9722-3F652DD1D244"> <p>Interface elements
+a user has to select and manipulate should not be smaller than the smallest
+average finger pad, that is, no smaller than 1 cm (0.4") in diameter or a
+1 cm × 1 cm square.</p> <p>In the Symbian platform, UI style defines the minimum
+sizes for a UI element considered as finger usable:</p><ul>
+<li><p>7 x 7 mm with 1 mm gaps for index finger usage</p></li>
+<li><p>8 x 8 mm with 2 mm gaps for thumb usage</p></li>
+<li><p>List type of components should have minimum of 5 mm line spacing</p></li>
+</ul><p>The width of a finger limits the density of items on screen. If the
+items are too close, the user will not be able to choose a single one.</p><p>As
+the probability of the user touching the higher end of the button (than on
+the either side of the key) is high, button and icon sizes can be increased
+vertically.</p><p>Essential information or features, such as a label, instructions,
+or sub-controls should never be placed below an interface element that can
+be touched, as it may be hidden by the user's finger.</p><fig id="GUID-6D8108A5-9009-443D-9DF9-FA7AEFE1AD43">
+<image href="GUID-70FC2D13-493D-433F-9CFB-ACF9F512513F_d0e75057_href.png" placement="inline"/>
+</fig>Following are some useful tips that can be used while placing essential
+information or features on interface element:<ul>
+<li><p>With interfaces having input devices, it makes sense to place targets
+like menu items on the edges of screens because the cursor movement stops
+at the edge of the screen. </p></li>
+<li><p>When using a touch screen, a user seldom drags the finger across the
+screen like a cursor. Instead, they most likely lift their finger and place
+it on a new target. Users may have difficulties in reaching the objects located
+on the edges of the screen, especially if the physical device has protruding
+edges around the touch screen panel. Additionally, with some devices, the
+screen edges may be less sensitive to register the touch input.</p></li>
+</ul> </section>
+</conbody></concept>
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