Pete said:
They are vague so they have more lattitude to choose who they want.
"one year of specialized experience at a level close to the work of this job that has given you the particular knowledge, skills, and abilities required to successfully perform
Funny, but I haven't seen a single govt job that doesn't have that statement (in some form) as part of their qualification (my quote). You read it and think "no sh!t Sherlock, thanks for the clarification, duh" everytime.
But I'd also add that the people who write the job advertisements normally know little or nothing about the positions they are advertising. They have other ways of being selective as well. The employer decides internal, external, etc. so this is one way of narrowing down the candidates to the one you may have in mind for the job.
And qualifications on your resume normally only make you a match for the job if the words used in your resume match the keywords they are looking for. These keywords are normally manually placed into the system by a person who also doesn't necessarily know the job, which leaves the keywords they select (without talking with the employer) questionable.
It can be very frustrating when you're looking for someone specializing in air transportation, but they choose people who have been in general transportation who have driven a forklift once or twice....