good telephone screening

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hi,
in an effort to improve my telephone screening skills and save travel expenses to see the tenant face to face, i would like to screen people on the phone better. more specifically, these three questions:

1) what questions do you ask the prospective tenant on the first phone call?

2) what questions do you ask the employer of the tenant?

3) what questions do you ask references?

hopfully this can help us all out to decide whether we take the next step towards renting out to a tenant without wasting time.