Additionally, the zakat funds may be spent on the administration of a centralized zakat collection system. Representatives of the Salafi movement include propagation of Islam and any struggle in righteous cause among permissible ways of spending, while others argue that zakat funds should be spent on social welfare and economic development projects, or science and technology education. Some hold spending them for defense to be permissible if a Muslim country is under attack. Also, it is forbidden to disburse zakat funds into investments instead of being given to one of the above eight categories of recipients.