A system is configured for a developer/modeler to be able to define various steps. Each step can be a step in the installation of a product. Each step can have one or more cards. Each card corresponds to a screen which can be presented to a user and which displays various information such as an instruction, a list of items to be installed, etc. There is a sequential relationship between the steps. A first step and a last step are defined, with each step in-between having a preceding and a following step. Similarly, for each of the steps that includes more than one card, there is a sequential relationship between the cards of the respective step, which cards include a first card, a last card, and intermediate cards, each of the latter of which has a preceding card and a following card.