Total addressable market (TAM)
TAM is the total revenue opportunity available for a product if every qualifying buyer purchased, useful only when built bottom-up from the ICP definition.
A bottom-up TAM counts qualifying accounts from the ICP boundary and multiplies by expected contract value. A top-down TAM takes an analyst market size and claims a share. The first is testable against the account universe the company can actually name; the second is not.
TAM matters operationally because it bounds capacity planning and territory design. If the serviceable market inside a territory is smaller than the quota assigned to it, no amount of activity resolves the gap.
Where it breaks
TAM is taken from an analyst report, so territory quotas exceed the addressable accounts they contain.
Related terms
- Ideal customer profile (ICP)
- An ICP is a testable specification of the accounts a company can serve profitably and repeatably, expressed in attributes the revenue system can actually evaluate.
- Capacity planning
- Capacity planning derives how many productive selling resources are required to hit a revenue target, given ramp time, attrition, productivity and coverage assumptions.
- Territory design
- Territory design is the allocation of accounts to sellers such that each territory contains comparable attainable opportunity, not merely a comparable account count.
- Segmentation boundary
- A segmentation boundary is an enforced rule that assigns an account to exactly one segment and governs which motion, pricing and coverage model applies to it.
Field notes on this
- You just inherited RevOps. Start with a charter.
Being told to "own revenue operations" is not a mandate. Until authority is written down, every decision you make is reversible by whoever objects loudest.
- Why four teams report four different revenue numbers
A reconciliation problem may be definitional, technical, or both. Test the metric contract before buying another data platform.