The business case for switching to a PSA: a five-step payback test
The business case for switching to a PSA comes down to three of your own numbers: what staying costs, what switching costs and how fast it pays back. Approve the switch if it still pays back in under 12 months when adoption goes half as well as planned, and pilot first if it doesn't. I work at Teamwork.com now, but in my agency roles clients asked for more inside the same retainer, and nobody priced it, so staying always looked free.