How to use entry-summary with "if"

Hello,

i use my own template based on twentyeleven. I always thought that the entry-content is only on individual post pages and the entry-summary is on the posts list, but i can see now that both have the entry-content. Now, i would like to design differently the excerpts of the posts and their pages.

In the content.php, it is :

<?php if ( is_search() ) : // Only display Excerpts for Search ?>
<div class="entry-summary">
<?php the_excerpt(); ?>
</div><!-- .entry-summary -->
<?php else : ?>
<div class="entry-content">
<?php the_content( __( 'Continue reading <span class="meta-nav">→</span>', 'ilwebdesign' ) ); ?>
<?php wp_link_pages( array( 'before' => '<div class="page-link"><span>' . __( 'Pages:', 'ilwebdesign' ) . '</span>', 'after' => '</div>' ) ); ?>
</div><!-- .entry-content -->
<?php endif; ?>

which means for me that the entry-summary shows up only on search pages.

How should i change the first part of the “if” condition if i would like that the entry-summary shows up NOT ONLY on search pages but also on the posts list instead of the entry-content ? (Of course, on the individual post pages entry-content should remain).

Thanks in advance !