models, mock-ups, samples, test versions, trial versions, pilot versions, experimental versions, concept versions
contrive - formulate - conceive - invent - design - plan - work out - think up - dream up - draw up
To "devise" means to carefully think out and create a plan, method, system, or invention. It usually implies a deliberate, often creative mental process aimed at solving a problem or achieving a specific goal. The term is commonly used for strategies, schemes, procedures, or mechanisms that require some ingenuity or originality, such as devising a marketing plan, a new game, or a security system. In legal contexts, especially in older or formal English, it can also refer to disposing of property by will, but in everyday use it mainly focuses on the act of inventing or formulating something in the mind.