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The scalable approach that the Architect should choose to ensure that the lifecycle model is tracking lead stage changes accurately is to build trigger logic within the Revenue Cycle Model. This approach will allow the Architect to create a lifecycle model that is driven by Marketo Engage for the top half of the funnel stages and by specific data value changes in Salesforce for the bottom half of the funnel stages, without requiring an active revenue cycle model. Building trigger logic within the Revenue Cycle Model will enable the Architect to define the criteria and conditions for each stage transition, as well as to track and measure the lead movement across the funnel stages.

References: https://docs.marketo.com/display/public/DOCS/Revenue+Cycle+Modeler https://docs.marketo.com/display/public/DOCS/Revenue+Cycle+Modeler+Best+Practices