Just like ad creative and landing pages, workflows can be tested and optimised.
Test timing: Send welcome email immediately versus wait 1 hour versus wait 1 day. Which gets better open rates and conversion to next stage? Split traffic 33/33/33, run for 4 weeks, measure. Example result: immediate send gets 45% open rate, 8% convert to demo. 1-hour delay gets 52% open rate, 12% convert to demo (winner). 1-day delay gets 38% open, 6% convert. Implement 1-hour delay for all.
Test content: Welcome email variant A (focuses on product features) versus variant B (focuses on customer success). Split traffic 50/50 for 2 weeks. Measure reply rate, demo booking rate, progression to MQL. Implement winner.
Test logic: Lead assignment rule A (assign based on company size only) versus rule B (assign based on company size + industry). Measure: time to first contact, opportunity conversion rate, win rate. If rule B leads convert 30% better despite taking slightly longer to assign, it's the winner.
Test sequence length: Nurture sequence with 3 emails versus 5 emails versus 7 emails. More touches might improve conversion, or might annoy people. Test. Measure: MQL rate, unsubscribe rate, negative replies. Find optimal length.
Use same discipline as landing page testing: change one variable at a time, run for sufficient duration (minimum 2-4 weeks for email workflows), reach statistical significance (95% confidence), segment results if workflows serve multiple audiences.
Track tests in experiment log (same log as landing page tests). Document hypothesis, test design, results, learnings. Apply winning patterns across similar workflows.