⚖️ What’s a Defect Under Czech Law?

A defect is:

• mismatch with agreed specifications,

• functional error preventing normal use,

• incorrect results, crashes or incompatibility.

Examples:

• Button doesn’t respond.

• App crashes on normal use.

• App only runs on one OS, though multi-platform was agreed.

📌 What’s Not a Defect?

• Features that were never agreed in writing.

• Bugs caused by unauthorized interference.

• Errors due to changed environment (e.g., OS update).

• “Wishes” that were never part of the official brief.

Without a detailed scope, disputes become inevitable.

🧠 What’s the Role of Acceptance Testing?

Acceptance phase allows:

• the client to verify functions,

• the developer to deliver formally,

• both parties to close the stage with clarity.

After acceptance, only hidden defects may still be claimed.

🔧 What Are the Remedies?

Under Czech Civil Code (§ 2615), the client may:

• demand a fix,

• request a discount,

• or withdraw from the contract if the defect is significant.

But this only works if the contract defines defects, timelines, and procedures well.

🧱 Real Case

A client ordered a CRM app. After delivery, he claimed “Outlook integration is missing.”
The contract never mentioned Outlook.
The developer won in court.
→ Only agreed features can be legally enforced.