docs(qfd): add W14 portability requirement
Captures "I can carry the device and write away from a desk" as a distinct WHAT from W11 (multi-day battery), weight 8. Recomputed basement Σ (1546→1674); H8 climbs #6→#3 in the §3 priority list as its voter base widens to include W14, and H12 enters the top six at #4. §6's "(b) narrow voter base" override for H8 is retired and a new §7 ADR-008 vs W11+W14 unresolved-conflict bullet records that wall power in v0.1 now disappoints two WHATs, not one.
This commit is contained in:
Julien Calixte
77
docs/qfd.md
77
docs/qfd.md
@@ -42,6 +42,7 @@ What a user (= me) values about the device, with importance weights on a
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| W11 | Multi-day battery life (v0.8 onward) | 4 | [roadmap → v0.8](roadmap.md#v08--power-battery--sleep--) |
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| W12 | Local-only file scope coexists with git scope (v0.5+) | 5 | [README → scopes](../README.md#vision), [roadmap → v0.5](roadmap.md#v05--file-palette--multi-file--) |
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| W13 | Typography sets a writing-tool tone — typewriter or developer editor, never gadget | 7 | [roadmap → v1.0](roadmap.md), [README → UX](../README.md#ux-boundaries-set-by-the-medium) |
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| W14 | I can carry the device and write away from a desk | 8 | [roadmap → v0.8](roadmap.md#v08--power-battery--sleep--), [README → hardware](../README.md#hardware) |
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---
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@@ -86,22 +87,40 @@ from its basement row.
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keeps a fixed-size glyph-cache load on top of that arena pressure.
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2. **H2 — partial-refresh region area** (177). Bound how many pixels the
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panel has to flip per keypress; [ADR-003] is the hardware-side answer.
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3. **H1 — keypress latency** (148). The single most user-visible number;
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3. **H8 — save durability** (156). Atomic-rename + fsync; FAT's weakness
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is acknowledged in [ADR-007] and mitigated, not designed around. H8's
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voter base spans W3 (power-loss correctness), W6 (long sessions),
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W12 (file scopes), and W14 (carrying = unclean shutdowns) — the
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fourth voter is what lifts H8 into the top three by arithmetic alone.
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4. **H12 — Wi-Fi reconnect** (153). Mobile use is the chief driver
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(W14 + W2 + W4 + W6); [ADR-005] PAT auth and reconnect backoff own
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this. Previously below the top six on a stationary v0.1 reading;
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W14 promotes it.
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5. **H1 — keypress latency** (148). The single most user-visible number;
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[ADR-002] and [ADR-003] are co-conspirators.
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4. **H3 — full-refresh cadence** (144). The ghosting/flash tradeoff; lives
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6. **H3 — full-refresh cadence** (144). The ghosting/flash tradeoff; lives
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in the render layer.
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5. **H6 — push success rate** (134). [ADR-004] (gitoxide) and [ADR-005] (PAT
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over HTTPS) own this jointly; spike 7 is the kill-switch.
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6. **H8 — save durability** (132). Atomic-rename + fsync; FAT's weakness is
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acknowledged in [ADR-007] and mitigated, not designed around.
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**Why H8 ranks where it does.** HoQ totals reward functions that touch many
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WHATs over functions that absolutely matter for one WHAT. W3 ("Pulling
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power never corrupts the file", weight 10) is the strongest single
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requirement but its only strong link is H8. H9, by contrast, collects from
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W1+W2+W6 to reach 193. The fix isn't to re-weight cells to chase intuition
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— it's to use §6 as a curated rank that lifts narrow-but-critical
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functions explicitly.
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H13 (current draw, 137) sits at #7 — close to the top-six cutoff because
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W14 promotes the "wall-power for v0.1, measure first" stance from
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acknowledged tradeoff to watched metric. The v0.1 "measured only" target
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(§2) is still right; what changes is that bench multimeter readings (§6)
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gain a second audience — sizing the v0.8 cell against a real portability
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target, not just informing ADR-008's deferral.
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H6 (push success, 134) drops out of the top six. Its ADR ownership
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([ADR-004] gitoxide + [ADR-005] PAT) and spike 7 kill-switch are unchanged
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— the matrix simply reads W14's mobile-use voter as a louder signal for
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reconnect (H12) than for the push transport itself.
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**Why H8 ranks where it does.** Pre-W14, HoQ totals rewarded functions
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that touch many WHATs over functions that absolutely matter for one WHAT.
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W3 ("Pulling power never corrupts the file", weight 10) was H8's
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strongest single voter, but H8 still sat at #6 because its base was
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narrow. W14's "carrying = bumps = unclean shutdowns" widens H8's voter
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base and pushes it to #3 by arithmetic. §6's "table-stakes correctness"
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override is no longer the load-bearing argument for H8's prominence —
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its acceptance-criteria override for H4/H5 still is. See §6.
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The bottom three (H7 push time, H15 build time, H10 binary size) are real
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costs but ones we knowingly took on ([ADR-001]) and are not in the critical
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@@ -147,7 +166,9 @@ the design are called out below.
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Affordable at our size class but worth watching as features land.
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- **H11 stacks ↔ H13 current draw** (mild, future). Idle threads draw
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little but never zero; a future light-sleep policy (v0.8) wants them
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parked.
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parked. W14's portability outcome raises the value of that policy
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from "battery hygiene" to "the thing that lets the device leave the
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desk."
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- **H14 modularity ↔ H15 build time** (mild). More small crates = more
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link work. Boring vs valuable; we lean toward modularity.
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- **W13 typography ↔ H9 heap + H10 binary** (mild, future). Achieving a
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@@ -233,11 +254,12 @@ Function-to-component matrix (9 strong / 3 medium / 1 weak):
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## 6. Critical performance budget
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A curated rank, drawing from §3 importance and §4 conflicts but with two
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deliberate overrides: (a) acceptance-criteria critical paths (H4 boot,
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H5 soak) move up regardless of weighted-vote spread, and (b) table-stakes
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correctness (H8 durability) moves up despite a narrow voter base. These
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are the numbers spikes 2–7 must validate before integration starts.
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A curated rank, drawing from §3 importance and §4 conflicts, with one
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deliberate override: acceptance-criteria critical paths (H4 boot,
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H5 soak) move up regardless of weighted-vote spread. (Pre-W14 this list
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also lifted H8 durability over its narrow voter base; W14 has widened
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that base, so H8's #3 spot is now arithmetic — see §3.) These are the
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numbers spikes 2–7 must validate before integration starts.
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| Rank | Function | Target | Watched on | If we miss it |
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| ---- | -------------- | ------------------------------------- | ----------------- | ----------------------------------------------------------------------- |
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@@ -293,6 +315,14 @@ These are the live tensions we are watching, not deciding harder:
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serif = typewriter feel). Not yet decided whether to ship both or one;
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decision deferred to the v1.0 design pass. Cost preview per added font:
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+H9 glyph-cache footprint, +H10 binary for embedded assets.
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- **[ADR-008] vs W11+W14.** Wall power in v0.1 is now an explicit
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disappointment of two WHATs, not one (battery W11 + portability W14).
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The disappointment is bounded by [ADR-008]'s commitment to measure
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current draw on real hardware before sizing v0.8's cell — spec the
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cell against measured numbers, not against the spec sheet. The §3
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promotion of H13 (current draw) from #11 to #7 is the matrix
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registering this: bench multimeter readings now serve portability
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sizing as well as power profiling.
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---
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@@ -354,6 +384,15 @@ These are the live tensions we are watching, not deciding harder:
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(H8) get manual lifts. §3 now names the HoQ structural bias that makes
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the curation necessary — reward for spread, penalty for narrow-but-
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critical functions — using H8/W3 as the canonical example.
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- **W14 added — portability outcome.** Captures "I can carry the device
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and write away from a desk" as a distinct WHAT from W11 (multi-day
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battery), weight 8. Recomputed basement Σ; H8 lifted from #6 to #3 in
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the §3 priority list as its voter base widened from W3+W6+W12 to also
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include W14, and H12 entered the top six at #4; H6 dropped out. The
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ID "W14" was previously held by a deprecated typography row (see the
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"W13 reframed, W14 removed" bullet above); the slot is now repurposed.
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§6's "(b) narrow voter base" override for H8 no longer applies and
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has been retired in the §6 preamble.
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The minor variance between README's "~12 lines" and product/[ADR-003]'s
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"~11 lines" of edit area is within rounding for a 14 px glyph in a 240 px
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@@ -1,6 +1,6 @@
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# Quality House
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The 13 WHATs × 15 HOWs House of Quality. The roof carries function-vs-
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The 14 WHATs × 15 HOWs House of Quality. The roof carries function-vs-
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function correlations; the basement carries v0.1 targets (mirrored from
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[`qfd.md`](qfd.md) §2) plus the weighted-vote sums
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(`Σ = Σ(W weight × cell strength)`) and rounded relative weights. The
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@@ -241,8 +241,8 @@ market"), not as a fair head-to-head buyer's guide.
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\end{tikzpicture}%
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}
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% --- Dimensions tuned for the typewriter QFD (13 W x 15 H) ---
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\def\qfdNW{13}
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% --- Dimensions tuned for the typewriter QFD (14 W x 15 H) ---
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\def\qfdNW{14}
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\def\qfdNH{15}
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\def\qfdWhatW{4.6}
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\def\qfdImpW{0.7}
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@@ -307,7 +307,8 @@ market"), not as a fair head-to-head buyer's guide.
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10/{W10 I can repair or fork it with hobbyist tools},
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11/{W11 Multi-day battery life (v0.8 onward)},
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12/{W12 Local-only files coexist with git scope (v0.5+)},
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13/{W13 Typography sets a writing-tool tone}%
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13/{W13 Typography sets a writing-tool tone},
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14/{W14 I can carry the device and write away from a desk}%
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}
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\node[anchor=west, font=\scriptsize,
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text width=\qfdWhatTextW cm, align=left]
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@@ -315,7 +316,7 @@ market"), not as a fair head-to-head buyer's guide.
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% ---------- Importance (raw 1-10 weight) ----------
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\foreach \r/\w in {1/10, 2/9, 3/10, 4/7, 5/6, 6/9, 7/8, 8/7,
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9/8, 10/5, 11/4, 12/5, 13/7}
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9/8, 10/5, 11/4, 12/5, 13/7, 14/8}
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\node[font=\scriptsize] at ({-\qfdImpW/2}, {-\r + 0.5}) {\w};
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% ---------- HOWs (rotated column titles) ----------
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@@ -411,6 +412,12 @@ market"), not as a fair head-to-head buyer's guide.
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% W13 row 13: H9M
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\node[qfdrel/M] at ({9 - 0.5}, {-13 + 0.5}) {};
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% W14 row 14: H4W H8M H12M H13S
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\node[qfdrel/W] at ({4 - 0.5}, {-14 + 0.5}) {};
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\node[qfdrel/M] at ({8 - 0.5}, {-14 + 0.5}) {};
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\node[qfdrel/M] at ({12 - 0.5}, {-14 + 0.5}) {};
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\node[qfdrel/S] at ({13 - 0.5}, {-14 + 0.5}) {};
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% ---------- Roof correlations ----------
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\node[font=\scriptsize] at (C-1-2) {$+\!+$}; % H1-H2 strong reinforce
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\node[font=\scriptsize] at (C-1-3) {$-$}; % H1-H3 mild conflict
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@@ -435,20 +442,20 @@ market"), not as a fair head-to-head buyer's guide.
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% ---------- Basement: target / abs weight / rel weight % ----------
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\foreach \c/\tgt/\abs/\rel in {%
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1/{$\leq$200\,ms}/148/10,
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1/{$\leq$200\,ms}/148/9,
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2/{$\leq$1 line}/177/11,
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3/{1 : 20}/144/9,
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4/{$\leq$5\,s}/54/3,
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4/{$\leq$5\,s}/62/4,
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5/{$\geq$1\,h}/111/7,
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6/{$\geq$95\,\%}/134/9,
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6/{$\geq$95\,\%}/134/8,
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7/{$\leq$30\,s}/27/2,
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8/{100\,\%}/132/9,
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8/{100\,\%}/156/9,
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9/{$\geq$1\,MB}/193/12,
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10/{$\leq$2\,MB}/41/3,
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10/{$\leq$2\,MB}/41/2,
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11/{$\leq$80\,KB}/45/3,
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12/{$\leq$30\,s}/129/8,
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13/{obs.}/65/4,
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14/{$\leq$8}/117/8,
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12/{$\leq$30\,s}/153/9,
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13/{obs.}/137/8,
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14/{$\leq$8}/117/7,
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15/{$\leq$7\,min}/29/2%
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} {
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\node[font=\scriptsize] at ({\c - 0.5}, {-\qfdNW - 0.5}) {\tgt};
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@@ -462,7 +469,7 @@ market"), not as a fair head-to-head buyer's guide.
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\node[anchor=east, font=\scriptsize\itshape]
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at ({-0.1}, {-\qfdNW - \k + 0.5}) {\lbl};
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% ---------- Perception zone: 5 products x 13 WHATs (0-5 scores) ----------
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% ---------- Perception zone: 5 products x 14 WHATs (0-5 scores) ----------
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% Columns: \so=Typoena target, \st=reMarkable 2 + Type Folio,
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% \sf=Freewrite Traveler, \sg=Pomera DM250,
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% \sh=Freewrite Smart Typewriter.
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@@ -481,7 +488,8 @@ market"), not as a fair head-to-head buyer's guide.
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10/5/4/2/1/2,
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11/1/5/5/4/5,
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12/3/1/2/3/2,
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13/3/5/2/2/2%
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13/3/5/2/2/2,
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14/2/4/5/2/5%
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} {
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\pgfmathsetmacro{\xo}{\qfdNH + (\so + 0.5)*\qfdCmpW/6}
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\pgfmathsetmacro{\xt}{\qfdNH + (\st + 0.5)*\qfdCmpW/6}
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@@ -597,14 +605,16 @@ hackable-Linux 3).
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| W11 | Multi-day battery life (v0.8 onward) | 1 | 5 | 5 | 5 | 4 | Typoena v0.1 = wall-powered (battery deferred). reMarkable + both Freewrites legendary (~4 weeks; Sailfish trimmed −30 % typing / −50 % idle). Pomera ~24 h. |
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| W12 | Local-only files coexist with git scope | 3 | 1 | 2 | 2 | 3 | Typoena v0.5+ design. reMarkable cloud-only. Freewrites have local + Postbox but no VCS. Pomera = pure local. |
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| W13 | Typography sets a writing-tool tone | 3 | 5 | 2 | 2 | 2 | Typoena v0.1: single mono (serif option in v1.0). reMarkable: rich type rendering. Freewrite + Pomera: utilitarian. |
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| W14 | I can carry the device and write away from a desk | 2 | 4 | 5 | 1 | 5 | Typoena v0.1 wall-powered (ADR-008), no enclosure spec yet — desk-bound by design. reMarkable + Type Folio bag-friendly with bulk. Freewrite Traveler is the form-factor reference (~1.6 lb, folds). Smart Typewriter ~5 lb, desk-bound. Pomera DM250 pocketable foldable. |
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**Totals** (sum across 13 WHATs, no weighting): Typoena 50, Pomera 45,
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Freewrite Traveler 42, reMarkable 41, Freewrite Smart Typewriter 41
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(Traveler pre-Sailfish 39; Smart pre-Sailfish 38; reMarkable W1 dropped
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3→2 after author's firsthand test). Pomera still ranking second is the
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useful signal — we're effectively building "Pomera + Wi-Fi + git +
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hackable BOM", which re-confirms the differentiation thesis from
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`README.md`.
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**Totals** (sum across 14 WHATs, no weighting): Typoena 52, Pomera 50,
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Freewrite Traveler 47, reMarkable 45, Freewrite Smart Typewriter 42
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(Traveler pre-Sailfish 44; Smart pre-Sailfish 39; reMarkable W1 dropped
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3→2 after author's firsthand test). Pomera closing to within 2 of
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Typoena is W14 doing what W14 should — surfacing the dimension on
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which v0.1's tethered MVP loses ground that v0.8 is expected to
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recover. The "Pomera + Wi-Fi + git + hackable BOM" framing from
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`README.md` still holds and reads stronger.
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Weighted totals (Σ score × W weight) tell the same story with more
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contrast — left as exercise; the unweighted view is enough to read the
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@@ -629,12 +639,12 @@ picture.
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- **Importance (left column)** is the raw 1–10 weight from `qfd.md` §1, not
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a normalised %, so adding stays cheap when a WHAT shifts. Sum of weights
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is 95; treat each unit as ~1.05 % if you want a percentage view.
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is 103; treat each unit as ~0.97 % if you want a percentage view.
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- **Roof** carries the §4 symbols translated into classical QFD glyphs:
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`++` strong reinforcement (`◎`), `+` mild reinforcement (`○`), `−` mild
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conflict (`×`), `−−` strong conflict (`⊗`).
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- **Basement rows** are: v0.1 target → §3 column sum (`Σ` of
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`weight × strength`) → relative weight as integer % of total (1546).
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`weight × strength`) → relative weight as integer % of total (1674).
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Relative weights round to 100.
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- **H7, H10, H15** (push time, binary size, build time) sit at the bottom
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of the basement — knowingly-paid costs per `qfd.md` §7, not signals to
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Block a user