Business Case Writing
Part of the Product Management Roadmap
In short
When you ask for budget or headcount, ideas alone don't win. A clear business case with costs, returns and risks gets the yes, or an honest no.
A structured argument for why a product investment is worth making — expected cost, expected return, key assumptions and risks — the document that gets a big bet greenlit or killed.
Think of it like this
Convincing your parents for a laptop
You don't just say "I want a laptop". You explain: it costs ₹55,000, it saves trips to the cyber café, lets you take paid freelance work, and here's the risk if it breaks. Parents say yes to a plan, not a wish.
Watch it happen
Sections of a one-page business case
1/5Problem: what's broken or missed, with numbers. "We lose 12% of carts at payment."
The big ideas
What you need to know
Include "do nothing"
Comparing against doing nothing shows the real cost of waiting.
Show assumptions
List the numbers you assumed, like a 2% lift. Reviewers trust what they can check.
Ranges, not one number
Give a low, expected and high case. It's more honest and more convincing.
Keep it short
One or two pages with a summary at the top. Details can go in an appendix.
Save yourself the pain
Common mistakes
Oops
Presenting only the best-case return.
Do this instead
Show low, expected and high cases, and what each depends on.
Oops
Hiding risks to make the case look stronger.
Do this instead
Name the risks and your plan for each. It builds trust.
Your mission
Write a one-page case
Quick check
Why include a "do nothing" option in a business case?
Go deeper
- 1Write a one-page business case for a feature idea with a rough cost/benefit estimate.
- 2Learn to state your assumptions explicitly so reviewers can challenge the right things.
- 3Practice defending the case against the question 'what would have to be true for this to fail?'
More topics at this stop
Pricing Strategy
Revenue Models (Subscription, Freemium, Transactional)
Unit Economics: CAC, LTV & Payback Period
P&L Basics for PMs
ROI Calculation
Competitive Pricing Analysis
Packaging & Tiering
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