Likewise, contracts for goods and services necessary to prevent exceptional risks to national security or public security, qualified by supreme decree issued through the Ministry of National Defense on the proposal of the corresponding Commander in Chief or, where appropriate, of the General Director of Chilean police or of the Director of Investigations.

# c. Invitation to Bid and Bidding

If the bidding is public, the call to bid will be open to all possible interested parties. When the tender is private, we must decide to invite to participate. The selection of suppliers in a private tender must be very careful, since determine the possible offers to receive and, therefore, it is vital to include recognized suppliers and that it belonged to the item of the product or service required. According to the law, for private bidding, there must be at least three guests. However, it is recommended to invite more, because it increases the transparency of the process and the offers improve when the competition increases. The call for bids-public or private must, necessarily be published at the information system, ChileCompra.cl. However, the process can be complement by contacting those suppliers that are desired to show up.