| Who does the sourcing work | ZOPA specialists, as a co-buyer beside your team | Your own buyers or user teams | The agency, largely on your behalf |
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| Control and visibility | You see every quote and approve every award | Full control, with the full workload | Often reports back after the work is done |
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| Buying power | Pooled demand across organisations | Limited to your own volumes | Depends on the agency’s network |
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| Technology and audit trail | ZOPA Flux with an audit trail on every step | Whatever you build or buy yourself | Varies by agency |
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| Scaling up | Add scope or move up a plan | Hire and train more people | Renegotiate the engagement |
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| Overhead | Quoted to your volume and scope | Salaries, tools and training | Fees set by the agency |
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