MathPlus is an improved Windows version of Theorist, a computer-algebra package. Aimed at secondary schools and colleges, it is described as "a powerful tool to solve routine or sophisticated equations with full graphing facilities". Single user: Pounds 199. An unlimited site licence for secondary schools costs Pounds 995. Robinson Marshall, Nadella Building, Progress Close, Leofric Business Park, Coventry CV3 2TF. Tel: 01203 233216.