The Survey System Version 9.5 is available in two packages:
Possibility to upgrade from one Edition to another you only have to pay the difference between the two Editions.
An advanced user has also possibility to add optional modules, when new need arises. Upgrades and optional modules can be delivered on day-to-day basis via e-mail, so that you immediately are ready to solve new tasks.
You are welcome to download a fully functional Evaluation Edition of The Survey System. Its only limitation is a restriction on the amount of data you can use at one time.