The most critical defects often exist between systems rather than within them

 

 

Would you like to quickly find where some of your most critical system defects? 

Take a lesson from healthcare: transitions in care are well-documented high-risk times. This is not a one-off issue but a repeatable pattern.

Software systems exhibit the same pattern during transitions:

• You might say, “System A did its job,” but “System B holds the truth.” It's essential to prove it.

Consider this real-world example:

Your doctor says they sent the prescription. The pharmacy claims they don’t have it. Ultimately, you still don’t have your medication. The gap lies in this hand-off: sent ≠ received ≠ applied.

To address this, lean into testing transitions:

• Define what “done” means on both sides of the transition.
• Trust, but verify: don’t stop at “sent.” Confirm it was received and actually applied.

Test both acceptable and unacceptable outcomes:

• Acceptable: slowdowns, retries, short delays.
• Not acceptable: missing, wrong, late, duplicates.
• If you exceed a limit, log it as beyond tolerance - don’t mask issues behind a green check.

Why is this important? Testing these hand-offs provides evidence where it matters most and can make the rest of your test suite feel surprisingly simpler. Your customers will thank you for it.