MODAS were written in Borland Delphi, the best programming language for Windows applications development by Ivan Krastev. The source code is not provided. MODAS is designed to allow you to quickly and easy evaluate the performance of optical systems. It is designed to be simple to use so that it may be used without a long learning period. However, it includes powerful features that make the software useful to advanced users. This program is an design and analysis tool. This program will make you on optical expert. After you have run MODAS, the analysis of the optical systems will make sense to you.