Wikipedia presents 3 basic methodologies for software development as illustrated in this picture. There is another interesting description of other methodologies and variations on www.noop.nl if it is of interest.
The nature of Omnis Studio as a development tool lends best to the prototyping methodology which is more recently known as Agile Development
From Wikipidia, agile software development refers to a group of software development methodologies based on iterative development, where requirements and solutions evolve through collaboration between self-organizing cross-functional teams. The term was coined in the year 2001 when the Agile Manifesto was formulated.
Agile methods generally promote a disciplined project management process that encourages frequent inspection and adaptation, a leadership philosophy that encourages teamwork, self-organization and accountability, a set of engineering best practices intended to allow for rapid delivery of high-quality software, and a business approach that aligns development with customer needs and company goals.