Farze Kifayah means that it is obligatory for at least some members of a city or town to witness the moon. And strict guidelines of Shariah should be followed in this matter as new measures are adopted by communities and nations which completely contradict the rules of Shariah. People are keen to celebrate Eid on the same day throughout the world, this is of course desirable, but the laws of Shariah should not be compromised to achieve this.