The initial prototype had to be made more rugged for public use.

The first flight of the initial prototype was in September 2001.

The game took fourteen months from initial prototype to final build to complete.

This puts the knowledge workers in a position to now develop the initial prototype for the fourth step.

There has been little practical interest in constructing one beyond the initial prototype, however.

With a 4GL an initial prototype can be put together quickly.

The initial prototype of this was superseded in 1990 with a commercial service.

The initial prototype was developed further, and acceptance tests were completed in December 1993.

The initial prototype is developed that includes only user interfaces.

The initial prototype performed its first flight in late 1958 and went into production in 1960.