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The Record Behind the Decision / Unit 2
Lesson 4 · Judgment · Week 4
What else could explain the result?
Which explanations fit the same passing result, what would tell them apart, and what would you record while they are still open?
Start with the question
A result passes, and the recommendation explains the rise behind it as normal variation. Several other explanations fit the same numbers. What would tell them apart, and what do you record while they are still open?
By the end of this lesson you should be able to:
- List the explanations that fit the same result, without approving the first one offered.
- Identify the item on file that would look different under each explanation.
- State a conclusion limited to the evidence, with what has and has not been checked.
- Explain what the authorizing person is deciding on, and what the record owes them.
Read
Read the article this lesson is built on (about 7 minutes): What Else Could Explain the Result?
Watch
Transcript
Last lesson, a passing result told you what a sample measured. It did not tell you why the values moved.
This lesson puts you inside a synthetic release case. You will make three decisions. New evidence arrives after the first.
Start with the first packet. The impurity reads 0.09 percent against a limit of 0.10, after 0.04, 0.06 and 0.07. System suitability passed in every run. The draft says the rise is normal variation, and recommends release.
Before you answer, separate three things. What do the results establish? What does the recommendation claim beyond them? And what would you need to see next?
Then the second packet arrives. The newest batch used a new lot of the active ingredient. The column was replaced before its run. And the values were already rising before either change.
Notice what that does. Two changes coincide with the highest value, yet the rise began earlier, so neither explains the whole sequence on its own. Normal variation, the material, the method and the process all still fit the same numbers.
So the question changes. It is no longer only what the number is. It is which explanations remain, and which item on file would look different under each of them.
The third decision is the authorizing person's. What should the record say, so that they decide on what the file supports, and not on an explanation nobody tested?
Make each judgment before you read the worked explanation. Then compare your reasoning with the worked explanation, including what remains uncertain.
Work the case
This is a synthetic case. It uses no real batch, product or person. You will examine evidence, make a judgment, receive more evidence, and reconsider. The first judgment is free; the rest of the case is part of the Season One pass. Usage events (which option was chosen and whether the case was completed) are recorded for analytics; no free text is collected.
Read the case without the exercise
The Consistent Batch
A batch of a solid oral dosage form has completed release testing. Every result on the summary is within its limit. The Quality reviewer is preparing the release recommendation for the authorizing person, who will decide under the site’s procedure whether the batch is released.
The draft recommendation reads: "All results are within specification. Consistent with previous batches. The increase is normal variation. Recommend release."
In US CGMP, 21 CFR 211.165(a) requires appropriate laboratory determination of satisfactory conformance to final specifications for the drug product before release, 21 CFR 211.165(e) requires the accuracy, sensitivity, specificity and reproducibility of test methods to be established and documented, and 21 CFR 211.192 addresses the review of production and control records before a batch is released.
Initial evidence packet
- Release testing summary: identity, assay, dissolution, content uniformity and the unspecified-impurity test all within limit. Unspecified impurity for this batch: 0.09% against a limit of 0.10%.
- Trend table for the same test, oldest first: the three previous batches read 0.04%, 0.06% and 0.07%.
- System suitability: passed for each of the four analytical runs.
- Draft recommendation: "Consistent with previous batches. The increase is normal variation. Recommend release."
Establishes: The impurity result for this batch is 0.09%, within the 0.10% limit. The three earlier batches read 0.04%, 0.06% and 0.07%. System suitability passed in each run.
Does not establish: That the process is consistent, that the rise across the four batches is normal variation, or what caused the values to rise.
The additional evidence, the two further judgments, the comparison of interpretations and the worked explanation are part of the Season One pass.
Written with AI under ComplianceWorxs governance. Checked by a separate AI reviewer against the cited sections of 21 CFR Part 211 on November 7, 2026. No human GMP expert has reviewed or signed off this content; it is not a regulatory determination.
How access and saved progress work
- After a unit is released
- It stays open to you. Work through it at your own pace, in any order within the units released so far.
- Your access period
- 12 months from the day you enroll, for one person.
- Saved progress
- Your place in each case exercise is saved to your pass. Open your access link on any device to continue where you left off. Without a pass, progress is saved only in that one browser.
If a decision like this is open for you
These already exist on this site. You do not need them to continue the lessons.
Check a batch release decision against what the results do and do not show.
$59Follow an out-of-specification investigation from first result to conclusion.
$149← What do the results show?Unit 3 opens on December 14