In order to differentiate between the crimes of burglary, aggravated burglary and robbery, it is necessary to identify the key elements in each offence. In burglary, a person must enter a building as a trespasser with intent to steal. In aggravated burglary, a person must be in possession of any weapon of offence at the time he intends to carry out the burglary. A person is guilty of robbery if he steals and uses force on any person or makes any person afraid of being subjected to force. He can do this at the time of the offence or before it. The word steal is interpreted in the same way as the basic definition of theft. In other words, if you steal something, you dishonestly appropriate something belonging to another with the intention of permanently depriving the other of it.