Understanding which systems will form the digital technology programme is not an essential consideration when developing a digital strategy. It is a more detailed and technical aspect that can be defined later in the implementation phase. The essential considerations when developing a digital strategy are more focused on understanding the organization's vision, goals, values, customers, markets, competitors, opportunities, risks, and capabilities. Reference: ITIL 4 Leader: Digital and IT Strategy, page 5-6

Synergism is a parallel model that is based on using the income generated by an existing business model to fund a new digital business model until it can fund itself. It is a way of balancing the risks and rewards of innovation and disruption by creating a synergy between the old and the new business models. Reference: ITIL 4 Leader: Digital and IT Strategy, page 39