Mr Robertson was commenting after the launch in London of the White Paper The Citizen's Charter - Five Years On.
Mr Robertson said: 'The citizen's charter is making a real difference to public services in Scotland.
'We all use public services, and since the charter's launch in 1991 the focus has moved firmly onto us as customers, our needs and expectations.
A CD-Rom, bringing together performance information on schools and colleges and health and local authority services is to be made available for the first time today.
Copies will be sent to schools and libraries and the public can order free copies by calling 0345 223 242.
To help people get the most out of their services a booklet bringing together the main points from key Scottish and UK Charters is also to be published today. 'Know Where You Stand' will be available from Citizen's Advice Bureaux, and public service outlets, including libraries, or by calling 0345 223 242.