Harvard Business School Services Model
The Service-Profit Chain links how you treat staff to what customers get and back to profit - internal service quality drives employee satisfaction, which drives customer satisfaction, which drives revenue - so cutting the wrong end of that chain shows up as a customer problem months later.
A chain runs left to right, starting with how staff are treated and finishing with the profit that results.
Reach for this when…
- Customer satisfaction is falling and nobody's connected it to what's happening with frontline staff.
- Cost-cutting hit staff conditions or training and the effects on customers haven't shown up yet.
- You need to justify investment in staff to a board that only tracks revenue.
How to run it
- Assess internal service quality: workplace design, tools, and how staff are actually treated.
- Track employee satisfaction and, crucially, retention - churn is the leak in this chain.
- Measure external service value: what customers actually experience, not what you intend.
- Track customer satisfaction and loyalty, not satisfaction scores in isolation.
- Connect loyalty to revenue and profit, and trace problems back up the chain, not just down.
A worked example
Situation. Dra. Valentina Ibarra runs Clínica del Sol, a small dental clinic chain in Córdoba, Argentina, and had cut receptionist hours and dental-assistant staffing to protect margin.
Applied. Six months later, with patient complaints and no-shows rising for no obvious reason, she traced the chain backwards from falling loyalty scores to staff data and found her best assistants had quit in the same window as the cuts.
Result. She restored staffing and added a small retention bonus. Loyalty scores recovered over the following two quarters, well before revenue did.
The catch
The chain is correlational, drawn mainly from service-sector data, and its lag makes it easy to cut the wrong end and only see the damage a year later, once the model has been forgotten. It also assumes staff behaviour is the main driver of customer experience, which is less true where the product itself does the heavy lifting. It's easy to measure the ends, cost and revenue, while skipping the harder middle links, like employee retention.
If you can show the revenue number but not the employee retention number, you don't have the chain, you have a hope.
Origin: James Heskett, W. Earl Sasser and Leonard Schlesinger, Harvard Business School