| Year | Author | Classification |
|---|---|---|
| 1987 | OECD1 | Beveridge model |
| 1997 | WHO2 | Mixed system in transition from insurance-financed to tax-financed system |
| 1998 | European Parliament3 | Public taxation and direct payments |
| 2000 | Moran4 | Insecure command and control state |
| 2003 | OECD5 | Public integrated model |
| 2007 | Busse et al.6 | Tax financed system with high private share |
| 2009 | Thompson et al.7 | Tax financed model |
| 2009 | Wendt8 | Low budget restricted access |
| 2010 | Reibling9 | Mixed regulation states |
| 2010 | Jourmard et al.10 | Mostly public provision and public regulation, with gate-keeping and limited choice of providers, under strict budget constraint (special case of Portugal) |
| 2012 | EU11 | Centralized but structured at the territorial level |