Merge pull request #362 from w3c/MH_Proposal1

Mh proposal1

Author: lseeman

design-guide/o1p01-clear-purpose.html

@@ -52,6 +52,11 @@ How it Helps
     a video. They can tell by the video title that this video has the
     information they need.
   p>
+  <p>
+    For this pattern to be useful, each page must have a clear purpose. It works best when each page covers
+    a single unifying topic. (See pattern <a href="#make-the-site-hierarchy-easy-to-understand-and-navigate-pattern">
+      4.3.2 Make the Site Hierarchy Easy to Understand and Navigate a> for more details.)
+  p>
 section>
 <section>
   <h5 class="coga-5">More Detailsh5>

design-guide/o2p02-site-structure.html

@@ -46,15 +46,19 @@ What to do
       main menu items under which they fall. It should be easy to know that
       sub-menu items are there and how to get to them. Users should guess
       correctly, the first time, where to find sub menu items.
-    li>
-  ul>
-  <p>Make it easy to identify:p>
+   Make it easy to identify:
   <ul>
     <li>the site organization,li>
     <li>the menu and content structure,li>
     <li>that there are sub-menus and,li>
     <li>if there are sub-menu items, how to reach them.li>
   ul>
+    li>
+<li>
+      Have each page or screen have a single purpose and a limited number of topics.
+      Ideally a page or screen will have one main unifying topic.
+    li>
+  ul>
 section>
 <section>
   <h5 class="coga-5">How it Helpsh5>