EXD.3:4 - Solution

EXD.3:4.1 - Select each contribution

Name the current question and the claims its answer requires. FPF C.37 supplies the general representation-selection and co-use question. Apply it here to the explanation: what must the recipient locate, compare, connect or enact?

Choose one sufficient representation when it serves that use. Add a representation only for a contribution that matters, such as seeing count/mean/sum correspondence while using a formula. Identify the claims and conditions each form carries and what it omits.

Separate construction choices. Adding the fact that count multiplied by mean reconstructs a sum changes explanatory content. Laying out that already stated relation in a table changes expression. A prompt or worked step supplied during use changes assistance. Preserve these differences when judging the result.

EXD.3:4.2 - Make the correspondence available where it is used

Use consistent names, units and referents. Put a label beside the quantity or feature it names, or give an unambiguous cross-reference when the medium prevents proximity. Make a line, arrow or spatial arrangement’s meaning explicit when it could denote different relations.

In human instructional use, select signaling, proximity, meaningful segmentation or preparation of a needed concept for the actual difficulty. Signal the next relation rather than highlighting everything. Keep a meaningful inference together within a segment. Let a recipient revisit an earlier step when the medium allows it.

Coordinate simultaneous channels so their contributions can be used together. Words may explain what a diagram’s relation means; duplicating a long text while narration and animation compete for attention may add burden. Select the arrangement under the actual task, recipient and medium conditions, retaining text when it provides needed access or reference.

EXD.3:4.3 - Preserve a usable reading path

Make the current question, selected relation and answer reachable in the chosen form. Expose the condition that changes the answer at the point it becomes consequential. A short answer may point to a fuller derivation; the recipient must know when that return is needed.

Provide usable labels and correspondences through the actual available channel. If color carries a distinction, include another cue that lets a recipient recover it without that color. If a static diagram cannot show a temporal dependence clearly, choose a warranted sequence or accompanying account. Where another modality is unavailable, retain the contribution in a form the recipient can use.

EXD.3:4.4 - Inspect the specific gain and loss

Try the intended inference or comparison under the stated conditions. EXD.6 helps choose a bounded comparison when its result can change which expression is retained.

Keep content, expression and help changes identifiable. A promising arrangement can be retained provisionally on a stated design reason; an observed advantage requires the corresponding evidence. Restore an omitted condition or return to the source when the representation invites a different claim. Stop adding forms when one arrangement is sufficient.