What's the "A" for?

Audience. When writing an observable, measurable objective, you need to address four components. Audience is the first and the easiest. It determines "who" is expected to demonstrate the skill, task, activity, or behavior. Here are some examples:
"Johnny..."
"The second grade class..."
"The faculty..."
"Parents..."

...you get the picture. I'll bet you can guess what the "B" is for!