A verifiable fact a deal must have before entering a pipeline stage: a contact with the economic buyer role, an attached dated proposal, a signed order form. Mapped to a CRM field so the stage can be audited weekly. Stage probabilities are then derived from history, not set in a workshop.
"Customer is interested" is not a criterion. "Proposal attached, dated" is.
A criterion tightened in April makes the stage smaller from April. The version on the report says it is the definition, not the pipeline.
A fact that can be checked in the record before a deal enters a stage: a named economic buyer with logged contact, a dated next step agreed with the customer, a budget figure stated by the customer.
To enter proposal stage a deal needs a contact with the economic buyer role and a meeting logged with them. Thirty-one of seventy deals in proposal fail the test.
Stages defined by what the rep did, such as sent a proposal. Progress is what the customer did.