Product Management IRL

Product Management IRL

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Your Prototype Works. But Should Anyone Trust It? - Follow Up Story

How defining objectives and tradeoffs turns into a decision system

Amy Mitchell's avatar
Amy Mitchell
May 08, 2026
∙ Paid

What happened after writing a recent Product Management IRL article? These insights are for paid subscribers to Product Management IRL.

This week’s backstory is about trusting automation:

Your Prototype Works. But Should Anyone Trust It?

Your Prototype Works. But Should Anyone Trust It?

Amy Mitchell and Tim Varelmann
·
Mar 3
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What Prompted This Article?

This article started with an email from Tim Varelmann. He was offering a guest post on prototyping for product managers.

He also offered to give information on optimization strategies. That got my attention.

My product is being used in complex environments. I was looking forward to learning from Tim.

Tim’s story about working with a product team on a complex retail ordering system was one of those gritty stories that felt like a real situation from my product work.

Tim was brought in after a prototype planning tool wasn’t working right. He worked with the product team to define:

  • Objectives - what you are optimizing for

  • Constraints - naming where rules can bend

  • Tradeoffs - defining decision tension

He re-wrote the logic around objectives, constraints and tradeoffs.

And he did one more thing: he made the prototype show how the decision aligned with the objective.

With that change, the prototype could be tested and rolled out.

I don’t have the benefit of an operations research consultant in my product work. But I thought Tim’s approach to a complex situation would help.

What Happened After This Article?

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