Make sure you have read the entire agreement to ensure you fully understand your responsibilities and rights. Know what the rights and obligations of the agreement are. Never sign a contract you can`t understand. Contact a lawyer if you need clarification. In some constitutional monarchies and parliamentary republics, an order of the head of state (monarch or president) is valid only if it is countersigned by another competent person, such as the head of government, a competent minister or, in the case of promulgation of a parliamentary decision, a president of the legislative power. A countersigned contract is a very useful tool that you have probably signed several times without realizing it. .