Most clients are looking for softer shadows - especially for exterior scenes.
Today a client want to know how to make the shadows more defined.
Both of these conditions are determined by the amount of sky used to illuminate things, and by the amount of cloudiness.
Soft Sun Shadows
There are several things which effect the softness of shadows from the sun.
Sky
If the Sky is turned on, or turned on for illumination even when off,
then light from the sky will soften the shadows from the sun.
Cloudiness
Even with no sky, the Cloudiness Setting will make the shadows software by adding a cloudy effect.
Sun, Sky and Cloudiness settings
Default for Sun, Sky and Cloudiness
Sky turned off - Cloudiness still at 20
No sky or clouds