In investigations, assumptions kill

Like Jack Reacher once said:
“In investigations, assumptions kill.”

I think the same thing happens in software development more often than we realize.

As developers, we sometimes assume the client needs X when they actually meant X+, or sometimes something completely different. Other times, we assume how a feature should behave without fully understanding the business side behind it.

Recently, I faced a situation where my assumptions did not match what was actually expected. The result was misleading communication, wasted effort, and time spent building or thinking in the wrong direction.

And honestly, most of these situations do not happen because people are bad at communication.
They happen because everyone thinks they already understand enough.

One thing I started realizing:
Context matters more than assumptions.

If something is unclear:

• Ask your leader or client to elaborate more
• Ask why the feature exists, not only what it should do
• Repeat your understanding back to them
• Write down your assumptions clearly
• Do not treat “I think” as confirmation

A small clarification early can save:

• hours of development
• unnecessary meetings
• company money
• team frustration
• rework and technical debt

One practice that helped me a lot is explicitly listing assumptions before starting implementation.

Something as simple as:
“so you mean that this is for….., please confirm with me”

can completely change the direction of a discussion before problems happen.

Sometimes the issue is not technical skill.
Sometimes the issue is building the correct thing in the first place.

Assumptions do not only kill investigations.
They also kill time, clarity, and momentum in software projects.