HCD.19:5 - Archetypal Grounding
HCD.19:5.1 - A correct reader exposes a defective handout
The time-use case in HCD.18 provides the tasks and subject criteria. In a preserved clean-context agent walkthrough, the reader first saw M0: the handout defined task time from first touch to handoff and gave one uninterrupted example. The reader knew arithmetic and time-accounting distinctions; novice behaviour was not simulated.
For one person’s interrupted report, the first response was:
| Requested quantity | First answer |
|---|---|
| Active report work, 09:00–09:30 and 11:30–12:00 | 60 minutes |
| Incident work, 09:30–11:30 | 120 minutes |
| Report elapsed turnaround, 09:00–12:00 | 180 minutes |
| Total active work across both tasks | 180 person-minutes |
| Incident share | 120/180, or two-thirds |
The reader explained that it brought the active/elapsed distinction and person-time meaning from prior knowledge. M0 supplied the intervals and start-to-handoff wording; its uninterrupted example could not distinguish the two quantities.
The supported diagnosis is a material defect despite reader success. The central instruction assigns elapsed turnaround to a question about consumed effort. The subject criterion identifies the defect directly; the observed response shows expert correction of it. Neither observation establishes how a less-prepared human would perform.
The repair M1 states that active effort sums the intervals in which the named person works on the task, while elapsed turnaround spans first start to handoff. It separates person, task, active intervals, person-time, first start, and handoff in the record; works the interrupted case; and distinguishes a population’s person-time from wall-clock duration. This is a connected explanation–representation–example repair, not a cosmetic change to the word “time.”
HCD.19:5.2 - Keep the teacher contribution and test a changed denominator
Only after the first answer was preserved did the reader receive this teacher question: which intervals count as the person’s active work, and can two assigned tasks consume the same minute of that person’s effort? The reader then received M1, including the interrupted example’s numerical answer.
Its answer remained correct. It identified what M1 now supplied and declined to claim a learning gain: the distinction was already present in its first response, and the worked example supplied the same case’s numbers. The result is a supported walkthrough of the repair.
The later task changed the population. A worked on X from 09:00 to 10:00; B worked on Y from 09:00 to 11:00. Both were available from 09:00 to 11:00, and A did no other work in the remaining hour. The material and calculator remained available; no additional teacher cue was supplied.
The reader returned 1 person-hour for X, 2 for Y, 3 consumed person-hours in total, 4 available person-hours, and a 2-hour clock window. It compared 3 with 4 and identified M1’s population-denominator rule as the relevant material contribution. The numerical answer was not copied from M1.
This changed task rejects the repair’s plausible overgeneralization that every effort total must fit inside one clock interval. It supplies bounded evidence that this prepared reader used the repaired rule on a new population condition. It does not show novice learning, delayed retention, experienced burden, or a causal advantage over another explanation.
C.2.8 makes the structural interpretation precise. M0’s correct first answer does not show that M0 expressed the active-effort distinction: the prepared reader supplied the correction. M1 makes corrected relations available, but the teacher cue and same-case answer intervene before its use. The later population task supports recovery with M1 at that changed condition; it does not increase an amount at the initial condition. These facts qualify the structural question without replacing the profile’s material-use and repair values or establishing new learning.
HCD.19:5.3 - Return a complete disposition without inventing a complete success
Time-use S1 was constructed as a fuller evaluation than the original walkthrough. Reusing the earlier responses under S1 requires checking their compatibility, not retroactively claiming that the full specification was executed.
The following replay evaluates M1 under S1, using source inspection and the preserved observations above. It returns all six selected coordinates. The 0–5 meanings are S1’s bindings to the material profile, not converted scores from another programme.
| Coordinate | Value or missingness on this evidence | Grounds, limit, and next action |
|---|---|---|
| Subject validity | Insufficient evidence for S1’s complete subject-validity value | The inspected definitions, interval assignment, interrupted example, and population rule agree with the stipulated meanings. S1 also requires inspection of the offered tasks, key, and correction; that complete arrangement was not inspected for both tasks. Thus 4 is unestablished, while no bounded subject error justifies 3 and no additional checked boundary justifies 5. Retain the narrower correct-source findings and inspect the complete arrangement before assigning the full value. |
| Task and dependency coverage | 4, source-inspected for the two S1 task families | M1 supplies interval summation, turnaround, exclusive-person accounting, population aggregation, and the common-unit comparison. It therefore supplies the operations even though one operation lacks a worked example. Missing reader evidence belongs to the explanatory row; a further consequential coverage advantage needed for 5 is absent. |
| Explanatory sufficiency | Insufficient audience-compatible evidence for a supported-use value | M1 exposes the needed grounds and the prepared reader applies its population rule. That reader already knew the central distinction. The observation cannot qualify the promised introduction for readers possessing only S1’s stated prerequisites. That broader value needs such reader work; until it is obtained, retain the explicit missingness and current material findings rather than convert the gap to 0 or commission a study merely to complete this diagnostic. |
| Example discrimination | 3, bounded addition required under S1 | The interrupted example distinguishes active effort from turnaround, but M1 has no worked concurrent-person contrast. Its population rule is already present, so adding that contrast does not require rebuilding the central explanation chain. That is 3 rather than 2; the specified example evidence for 4 is incomplete. |
| Task and criterion validity | Insufficient evidence about the complete offered task-and-key arrangement | The original report task is domain-valid, and the evaluator’s criteria discriminate the named errors. The complete material/teacher criterion available for both S1 tasks was not an inspected product component in the walkthrough. Supply or inspect that component; do not treat the evaluator’s private key as already available to the learner. |
| Feedback and continuation support | Insufficient audience-compatible evidence for supported-use adequacy | The teacher question, M1, and later task were supplied. The prepared reader justified retaining its correct answer and continued on the changed task, satisfying S1’s allowed justified-retention branch for this reader. This supports that bounded continuation, but the reader’s prior time-accounting knowledge exceeds S1’s stated audience prerequisites. The stronger audience-compatible value still needs appropriate reader evidence of explained correction or justified retention under the declared support. The current missingness result does not by itself select that inquiry. |
The same missing task-and-key inspection constrains subject validity and task/criterion validity: a correct explanation can coexist with a false offered key. The evaluator’s correct answer supplies neither that component nor evidence of its inspection.
The overall S1 conclusion is repair needed and insufficient evidence for the declared supported-use conclusion. The 4 for task/dependency coverage and 3 for example discrimination cannot compensate for the missing evidence. The next material change is precise: add the concurrent worked contrast and make the intended criterion/support arrangement available. The next observation is also precise: an appropriate reader uses that arrangement, with the first attempt and actual assistance preserved.
This replay is a worked diagnostic judgement at the declared grain. It does not validate the scale’s reliability or claim that the original walkthrough was a complete S1 evaluation.
HCD.19:5.4 - A long-route defect can remain local
Consider a designed course route that introduces a measurement scale, uses it in a comparison, introduces a work budget, and then asks the learner to keep a journal against that budget. Inspection shows that the measurement and budget distinctions are available before their later uses. One return points to figure 17 when the relevant scale is in figure 26; a final diagram also contains an unexplained arrow.
The attachment repair is to correct the return and explain the arrow’s actual relation, then inspect their receiving uses. The supported measurement-before-comparison and budget-before-journal prefixes are preserved. Adding a new overview to every chapter would not follow from these two defects.
If a human reader reports a broader difficulty, retain that report under its task, prior knowledge and assistance conditions. Narrow the untested claim about human comprehension or burden immediately: the prepared reader’s recovery neither erases the report nor establishes experienced cognitive load. The confirmed return and arrow defects can still be repaired and their affected uses checked.
Suppose no target reader is available in the current revision window. Return the supported local material diagnosis and repair, with the reported broader difficulty unresolved. Do not infer that the rest of the course is adequate for that audience, and do not commission an unavailable human study to complete the editorial result.
Now change the receiving use to choosing the short route or an added overview for the next class. Suppose voluntary target-reader participation, appropriate protection and access are available before that decision: twenty reader-minutes and thirty provider/evaluator-minutes cover design, preparation, the attempt, a segment-timed burden question, feedback and interpretation. The observation can distinguish a missing connection from a prerequisite or assistance problem and thereby change which repair is used; that contribution warrants the stipulated whole burden and displaced work. Select the observation with its actual respondent, segment, timing, instrument and assistance conditions, including interference caused by asking. This completes a decision to observe, not a human-comprehension, burden, retention or learning result. The route and these availability conditions are constructed examples, not observed human Work.