TL;DR
Include unused examination capacity in the campaign decision, but do not treat an empty slot as money already lost or permission to spend. Build a worksheet from actual available appointments, expected collections, incremental costs and the complete campaign quote. Keep optical contribution separate unless there is a defensible basis for linking it. Use the model to test conditions, not predict ROI.
Verify that the capacity can actually be offered
Start with the appointment type, clinician, location and period the campaign would support. Ask scheduling to distinguish open template space from appointments the practice can actually accept. Staffing, equipment access, service scope and administrative processing can limit usable capacity even when a calendar looks empty.
Have the operating owner confirm which constraints apply in this practice. Do not advertise appointments merely because a software view displays openings. If the remaining capacity is for a particular associate or service, the public request path should say so.
Record whether the capacity is already covered by committed operating expense or would require extra sessions. That distinction changes the incremental decision. The campaign does not automatically recover a share of rent every time someone attends, and allocated overhead is not the same as cash that changes because of the campaign. Have finance supply the appropriate business treatment.
Build a capacity and acquisition worksheet
This is an original management model. Use actual practice inputs and clearly labeled planning assumptions supplied by the responsible owners. Leave unavailable fields blank. Do not borrow another practice's prices or capture assumptions.
| Variable | Practice input | Evidence and owner |
|---|---|---|
| A | Usable additional exam appointments in the defined period | Scheduling confirms appointment type, clinician, site and constraints |
| X | Additional attended exams being evaluated | Actual result after the campaign, or an explicitly uncertain planning variable |
| R | Expected collected amount per relevant exam for the selected appointment mix | Finance-approved basis, payer mix and collection uncertainty |
| V | Incremental cost per additional attended exam | Finance identifies costs that change with the activity |
| F | Additional fixed commitment needed for the campaign period | Extra sessions, staffing or other costs actually triggered |
| M | Complete acquisition commitment, excluding costs already assigned to V or F | Written fees, media, creative, software and practice implementation costs |
| O | Separately supported incremental optical contribution | Finance-approved linked evidence and fulfillment costs, if available |
Keep the period and appointment mix consistent across fields. Assign a cost to its appropriate field without counting it again elsewhere: implementation labor included in M must not also be included in F or V. If added sessions change capacity, update A and the associated costs together.
Use X ≤ A as the capacity constraint. It says the modeled additional attended exams cannot exceed the usable capacity defined in A. It is not evidence that the campaign can produce X. If appointments require different resources, separate the appointment groups rather than assuming every opening is interchangeable.
Keep the examination decision visible
Under the worksheet's definitions, the modeled incremental contribution before acquisition cost is X × (R − V) − F. After the acquisition commitment, the expression is X × (R − V) − F − M. These are arithmetic identities for the defined fields, not a forecast, accounting standard or recommended spending level.
For a campaign-incremental interpretation, X must represent attendance above what would have happened without the campaign. A campaign tag or an increase over an earlier period does not establish that counterfactual. If the evidence only supports observed attendance, label the calculation as contribution associated with that activity and leave the campaign's causal return unresolved.
Use the expression to ask what would need to be true, not to fill X with a vendor's unsupported promise. If collections or incremental costs are uncertain, record the uncertainty and ask finance which bounds can be supported. A negative exam-only expression should remain visible even if the owner hopes optical sales will change the result.
Where R does not exceed V, adding attended exams does not create a positive per-exam contribution under these definitions. That is a reason to inspect the inputs and service economics, not to assume marketing will fix them. Where F or M is unpaid but committed, have the commercial owner determine what can still be changed before treating the amount as avoidable.
Treat optical contribution as a separate condition
Do not insert the full value of an eyewear sale into an exam contribution field. If the practice can appropriately establish a linked optical contribution, add O as a separate term and disclose its basis. Product cost, remakes, refunds, fulfillment work and attribution uncertainty belong in the finance review where relevant.
For U.S. prescribers subject to the FTC Eyeglass Rule, a refractive examination cannot depend on agreeing to purchase ophthalmic goods from that prescriber. The rule's separation provision. Beyond that legal boundary, the worksheet should not assume every exam produces an in-house order. Leave O unavailable when the evidence does not support it.
Do not describe potential optical contribution as guaranteed lifetime value. Existing retail activity and orders from outside prescriptions need their own business analysis.
Translate the worksheet into a purchase condition
Ask the agency to price the work serving the usable appointment group and explain what it can verify: completed assets, received requests, confirmed exams or attendance. Include the staff work needed to respond. A low fee can still be a poor fit if the proposed campaign sends optical shopping questions to a calendar intended for clinical appointments.
Write the owner decision beside the worksheet: verified capacity ___; uncertain variables ___; purchase scope ___; maximum authorized commitment from the actual budget ___; repair needed before launch ___; review event ___. Use the scope budget guide to identify excluded work and the availability guide to keep public wording aligned with the schedule.
Frequently asked questions
Should the cost of an unfilled slot be added to the agency invoice?
Keep unused capacity as decision context. Do not count already committed overhead again as though the campaign creates another invoice. Finance should distinguish allocated cost, incremental cost and avoidable commitment.
Can a vendor supply our inputs?
It can ask useful questions and provide its actual quote. Practice owners must verify scheduling and finance inputs. A vendor benchmark is not evidence of this practice's collections or usable capacity.
Does a favorable worksheet justify launch?
It establishes conditional arithmetic only. Also verify the public offer, inquiry route, response coverage and commercial terms before releasing spend.