You can also tell that they've pretested them. They'll include the "X" over common errors, like choosing the wrong length screw, instead of just putting the picture of the right thing.
Cookbooks get dinged for this all the time... recipes are often not pre-tested before placement in many cookbooks, such that some now feature on the cover "Every recipe tested in our kitchens". It becomes apparent when cookbooks list common errors (yes, even expert chefs make common errors) or ways to fix bad outcomes or ingredient substitutions which actually still taste good.
It all looks so simple, til you get the curtain rod instructions (agreed!) or a non-tested cookbook.
Cookbooks get dinged for this all the time... recipes are often not pre-tested before placement in many cookbooks, such that some now feature on the cover "Every recipe tested in our kitchens". It becomes apparent when cookbooks list common errors (yes, even expert chefs make common errors) or ways to fix bad outcomes or ingredient substitutions which actually still taste good.
It all looks so simple, til you get the curtain rod instructions (agreed!) or a non-tested cookbook.