manzoor
As I said earlier, the Visa Officer has extensive decisive authority. In Dhaka Consulate, the Visa Officer allowed some of the primary applicants to attend interview without their spouses. The option was if the applicant was successful , he could pay the spouses fees and have their interviews taken too.
It totally depends on the Consulate and Officer. Such as the Visa Officer , in a pre-interview session will brief about the interview process on the date. He would also pick up the unsuccessful applicants (those who had problems in education or documentations), Visa Officer will also discourage them about attending the interview as they wont be successful and finally loose the interview fees