33 KiB
33 KiB
Quality House
The 14 WHATs × 14 HOWs House of Quality. The roof carries function-vs-
function correlations; the basement carries v0.1 targets (mirrored from
qfd.md §2) plus the weighted-vote sums
(Σ = Σ(W weight × cell strength)) and rounded relative weights. The
narrative reading of these numbers lives in qfd.md §3 (priority list)
and §4 (conflict list).
This file is the authoritative source for the matrix cells, the roof
correlations, and the basement Σ + relative weights. WHATs (§1) and HOWs
(§2) are mirrored here from qfd.md; if those diverge, trust qfd.md.
Out of scope here: §5 component mapping (would need a second house), §6 critical performance budget (already a curated rank), §7 tradeoffs (narrative), §8 inconsistencies (history).
For a blank version of the same chassis (WHATs, HOWs, importance, and
v0.1 targets kept; relations + roof + Σ basement left empty for practice),
see quality-house-empty.md.
The perception zone scores five products against the WHATs on a 0–5 scale. These are educated guesses, not measurements — see the scoring rationale below for what each cell is based on. Useful for self-positioning ("where do we land vs the market"), not as a fair head-to-head buyer's guide.
% =====================================================================
% QFD "House of Quality" preamble
% =====================================================================
\usetikzlibrary{arrows.meta, positioning, shapes.geometric, shapes.misc, calc, fit, backgrounds}
\newif\ifqfdshowroof \qfdshowrooftrue
\newif\ifqfdshowbasement \qfdshowbasementtrue
\newif\ifqfdshowcompetitive \qfdshowcompetitivetrue
\newif\ifqfdshowlegend \qfdshowlegendtrue
\newif\ifqfdshowimportance \qfdshowimportancetrue
\newif\ifqfdshowcorrlegend \qfdshowcorrlegendtrue
\newif\ifqfdshowevallegend \qfdshowevallegendtrue
\def\qfdNW{5}
\def\qfdNH{5}
\def\qfdWhatW{4.0}
\def\qfdImpW{0.9}
\def\qfdCmpW{3}
\def\qfdHdrH{2.6}
\def\qfdBasementN{4}
\def\qfdWhatsTitle{Customer needs}
\def\qfdImpTitle{Imp.\ \%}
\def\qfdPerceptionTitle{Comparative evaluation}
\def\qfdPoorLabel{poor}
\def\qfdExcellentLabel{excellent}
\def\qfdAltOneLabel{Typoena}
\def\qfdAltTwoLabel{Competitor A}
\def\qfdAltThreeLabel{Competitor B}
\def\qfdRelTitle{Relation}
\def\qfdCorrTitle{Correlation}
\def\qfdEvalTitle{Evaluation}
\tikzset{
qfdthin/.style ={line width=0.35pt},
qfdmed/.style ={line width=0.7pt},
qfdstrong/.style={circle, draw, fill=black,
minimum size=7pt, inner sep=0pt},
qfdmod/.style ={circle, draw,
minimum size=7pt, inner sep=0pt, line width=0.8pt},
qfdweak/.style ={regular polygon, regular polygon sides=3, draw,
minimum size=8.5pt, inner sep=0pt, line width=0.7pt},
qfdrel/.is choice,
qfdrel/S/.style={qfdstrong},
qfdrel/M/.style={qfdmod},
qfdrel/W/.style={qfdweak},
qfdalt1mk/.style={circle, draw, fill=black,
minimum size=6pt, inner sep=0pt, line width=1pt},
qfdalt1ln/.style={line width=1.2pt},
qfdalt2mk/.style={regular polygon, regular polygon sides=3, draw,
fill=black, minimum size=6pt, inner sep=0pt,
line width=0.7pt},
qfdalt2ln/.style={line width=0.7pt, dashed},
qfdalt3mk/.style={rectangle, draw, fill=black,
minimum size=5pt, inner sep=0pt, line width=0.7pt},
qfdalt3ln/.style={line width=0.7pt, dotted},
}
\newcommand{\qfdDrawGrid}{%
\foreach \c in {1,...,\qfdNHm} \draw[qfdthin] (\c, 0) -- (\c, -\qfdNW);
\foreach \r in {1,...,\qfdNWm} \draw[qfdthin] (0, -\r) -- (\qfdNH, -\r);
\foreach \r in {1,...,\qfdNWm}
\draw[qfdthin] (\qfdLeftEdge, -\r) -- (0, -\r);
\ifqfdshowroof
\foreach \c in {1,...,\qfdNHm}
\draw[qfdthin] (\c, 0) -- (\c, \qfdHdrH);
\fi
\ifqfdshowcompetitive
\foreach \r in {1,...,\qfdNWm}
\draw[qfdthin] (\qfdNH, -\r) -- (\qfdNH+\qfdCmpW, -\r);
\fi
\ifqfdshowbasement
\foreach \r in {1,...,\qfdBasementN}
\draw[qfdthin] (0, -\qfdNW-\r) -- (\qfdNH, -\qfdNW-\r);
\foreach \c in {1,...,\qfdNHm}
\draw[qfdthin] (\c, -\qfdNW) -- (\c, -\qfdNW-\qfdBasementN);
\fi
}
\newcommand{\qfdDrawRoof}{%
\ifqfdshowroof
\foreach \k in {1,...,\qfdNHm} {%
\pgfmathsetmacro{\rx}{(\k+\qfdNH)/2}
\pgfmathsetmacro{\ry}{\qfdHdrH + (\qfdNH-\k)/2}
\pgfmathsetmacro{\lx}{\k/2}
\pgfmathsetmacro{\ly}{\qfdHdrH + \k/2}
\draw[qfdthin] (\k, \qfdHdrH) -- (\rx, \ry);
\draw[qfdthin] (\k, \qfdHdrH) -- (\lx, \ly);
}%
\draw[qfdmed] (0, \qfdHdrH)
-- (\qfdNH/2, \qfdApexY) -- (\qfdNH, \qfdHdrH);
\foreach \i in {1,...,\qfdNH}
\foreach \k in {1,...,\qfdNH} {%
\pgfmathtruncatemacro{\jj}{\i+\k}
\ifnum\jj>\qfdNH\relax\else
\pgfmathsetmacro{\xx}{\i + \k/2 - 0.5}
\pgfmathsetmacro{\yy}{\qfdHdrH + \k/2}
\coordinate (C-\i-\jj) at (\xx, \yy);
\fi
}%
\fi
}
\newcommand{\qfdDrawScale}{%
\ifqfdshowcompetitive
\foreach \tk in {0,1,2,3,4,5} {%
\pgfmathsetmacro{\tx}{\qfdNH + (\tk+0.5)*\qfdCmpW/6}
\node[anchor=south, font=\scriptsize] at (\tx, 0.02) {\tk};
}%
\node[anchor=south, font=\scriptsize\bfseries, align=center,
text width=\qfdCmpW cm]
at ({\qfdNH + \qfdCmpW/2}, 0.7) {\qfdPerceptionTitle};
\node[anchor=north, font=\scriptsize\itshape]
at ({\qfdNH + 0.45}, -\qfdNW) {\qfdPoorLabel};
\node[anchor=north, font=\scriptsize\itshape]
at ({\qfdNH + \qfdCmpW - 0.45}, -\qfdNW) {\qfdExcellentLabel};
\fi
}
\newcommand{\qfdDrawZoneTitles}{%
\ifqfdshowimportance
\node[rotate=90, anchor=west, font=\footnotesize\bfseries]
at ({-\qfdImpW/2}, 0.12) {\qfdImpTitle};
\fi
\node[font=\scriptsize\bfseries, align=center, text width=\qfdWhatW cm]
at ({\qfdLeftEdge + \qfdWhatW/2},
{\ifqfdshowroof \qfdHdrH/2 \else 0.6 \fi}) {\qfdWhatsTitle};
}
\newcommand{\qfdDrawFrames}{%
\begin{scope}[qfdmed]
\draw (\qfdLeftEdge, 0) rectangle (\qfdNH, -\qfdNW);
\ifqfdshowimportance \draw (-\qfdImpW, 0) -- (-\qfdImpW, -\qfdNW); \fi
\draw (0, 0) -- (0, -\qfdNW);
\ifqfdshowroof
\draw (0, 0) rectangle (\qfdNH, \qfdHdrH); \fi
\ifqfdshowbasement
\draw (0, -\qfdNW) rectangle (\qfdNH, -\qfdNW-\qfdBasementN); \fi
\ifqfdshowcompetitive
\draw (\qfdNH, 0) rectangle (\qfdNH+\qfdCmpW, -\qfdNW); \fi
\end{scope}
}
\newcommand{\qfdDrawLegend}{%
\ifqfdshowlegend
\pgfmathsetmacro{\qfdLegX}{%
\qfdNH + \ifqfdshowcompetitive \qfdCmpW + 0.7 \else 0.7 \fi}
\pgfmathsetmacro{\qfdLegBottom}{%
-2.05
\ifqfdshowroof \ifqfdshowcorrlegend - 2.55 \fi \fi
\ifqfdshowcompetitive \ifqfdshowevallegend - 2.20 \fi \fi}
\pgfmathsetmacro{\qfdLegY}{\qfdHdrH - 0.4}
\begin{scope}[shift={(\qfdLegX, \qfdLegY)}]
\draw[qfdmed, rounded corners=2pt]
(-0.15, 0.4) rectangle (4.5, \qfdLegBottom);
\node[anchor=west, font=\footnotesize\bfseries] at (0, 0.1)
{\qfdRelTitle};
\draw[qfdthin] (0, -0.15) -- (4.35, -0.15);
\node[qfdstrong] at (0.22, -0.5) {};
\node[anchor=west] at (0.5, -0.5) {Strong (9)};
\node[qfdmod] at (0.22, -0.95) {};
\node[anchor=west] at (0.5, -0.95) {Medium (3)};
\node[qfdweak] at (0.22, -1.4) {};
\node[anchor=west] at (0.5, -1.4) {Weak (1)};
\ifqfdshowroof \ifqfdshowcorrlegend
\node[anchor=west, font=\footnotesize\bfseries] at (0, -2.10)
{\qfdCorrTitle};
\draw[qfdthin] (0, -2.35) -- (4.35, -2.35);
\node[anchor=west] at (0, -2.70) {{$+\!+$}\quad very positive};
\node[anchor=west] at (0, -3.05) {{$+$\phantom{$+$}}\quad positive};
\node[anchor=west] at (0, -3.40) {{$-$\phantom{$-$}}\quad negative};
\node[anchor=west] at (0, -3.75) {{$-\!-$}\quad very negative};
\fi \fi
\ifqfdshowcompetitive \ifqfdshowevallegend
\pgfmathsetmacro{\qfdEvalTop}{%
-2.10 \ifqfdshowroof\ifqfdshowcorrlegend - 2.55 \fi\fi}
\node[anchor=west, font=\footnotesize\bfseries]
at (0, \qfdEvalTop) {\qfdEvalTitle};
\pgfmathsetmacro{\qfdEvalSep}{\qfdEvalTop - 0.25}
\draw[qfdthin] (0, \qfdEvalSep) -- (4.35, \qfdEvalSep);
\pgfmathsetmacro{\qfdLegA}{\qfdEvalTop - 0.55}
\draw[qfdalt1ln] (0.05, \qfdLegA) -- (0.45, \qfdLegA);
\node[qfdalt1mk] at (0.25, \qfdLegA) {};
\node[anchor=west, font=\bfseries] at (0.55, \qfdLegA)
{\qfdAltOneLabel};
\pgfmathsetmacro{\qfdLegB}{\qfdEvalTop - 0.95}
\draw[qfdalt2ln] (0.05, \qfdLegB) -- (0.45, \qfdLegB);
\node[qfdalt2mk] at (0.25, \qfdLegB) {};
\node[anchor=west] at (0.55, \qfdLegB) {\qfdAltTwoLabel};
\pgfmathsetmacro{\qfdLegC}{\qfdEvalTop - 1.35}
\draw[qfdalt3ln] (0.05, \qfdLegC) -- (0.45, \qfdLegC);
\node[qfdalt3mk] at (0.25, \qfdLegC) {};
\node[anchor=west] at (0.55, \qfdLegC) {\qfdAltThreeLabel};
\fi \fi
\end{scope}
\fi
}
\newenvironment{qfdhouse}{%
\begin{tikzpicture}[x=1cm, y=1cm, font=\scriptsize,
line cap=round, line join=round]
\ifqfdshowimportance
\pgfmathsetmacro{\qfdLeftEdge}{-\qfdWhatW-\qfdImpW}
\else
\pgfmathsetmacro{\qfdLeftEdge}{-\qfdWhatW}
\fi
\pgfmathsetmacro{\qfdApexY}{\qfdHdrH + \qfdNH/2}
\pgfmathtruncatemacro{\qfdNHm}{\qfdNH - 1}
\pgfmathtruncatemacro{\qfdNWm}{\qfdNW - 1}
\qfdDrawGrid
\qfdDrawRoof
\qfdDrawScale
\qfdDrawZoneTitles
}{%
\qfdDrawFrames
\qfdDrawLegend
\end{tikzpicture}%
}
% --- Dimensions tuned for the typewriter QFD (14 W x 15 H) ---
\def\qfdNW{14}
\def\qfdNH{14}
\def\qfdWhatW{4.6}
\def\qfdImpW{0.7}
\def\qfdHdrH{5.0}
\def\qfdBasementN{3}
\def\qfdCmpW{3.4}
\qfdshowlegendfalse % we draw a 4-alternative legend manually
\def\qfdWhatsTitle{User-facing requirements (W)}
\def\qfdImpTitle{Weight}
\def\qfdPerceptionTitle{Competitive perception\\(0–5, guessed)}
\def\qfdPoorLabel{poor}
\def\qfdExcellentLabel{excellent}
% Perception-zone markers: shape + colour-blind-safe colour per product.
% Palette is Okabe-Ito (blue, vermillion, bluish green, reddish purple).
% Light fills + saturated outlines keep stacked markers legible.
\definecolor{qfdcTypoena}{RGB}{0,114,178}
\definecolor{qfdcRem}{RGB}{213,94,0}
\definecolor{qfdcFrw}{RGB}{0,158,115}
\definecolor{qfdcPom}{RGB}{204,121,167}
\definecolor{qfdcFrwS}{RGB}{86,180,233}
\tikzset{
qfdalt1mk/.style={circle, draw=qfdcTypoena, fill=qfdcTypoena!55!white,
minimum size=6.5pt, inner sep=0pt, line width=1.1pt},
qfdalt1ln/.style={line width=1.2pt, qfdcTypoena},
qfdalt2mk/.style={regular polygon, regular polygon sides=3,
draw=qfdcRem, fill=qfdcRem!55!white,
minimum size=7pt, inner sep=0pt, line width=0.9pt},
qfdalt2ln/.style={line width=0.8pt, dashed, qfdcRem},
qfdalt3mk/.style={rectangle, draw=qfdcFrw, fill=qfdcFrw!55!white,
minimum size=5.5pt, inner sep=0pt, line width=0.9pt},
qfdalt3ln/.style={line width=0.8pt, dotted, qfdcFrw},
qfdalt4mk/.style={diamond, aspect=1, draw=qfdcPom,
fill=qfdcPom!50!white,
minimum size=7pt, inner sep=0pt, line width=1.0pt},
qfdalt4ln/.style={line width=0.8pt, dash dot, qfdcPom},
qfdalt5mk/.style={regular polygon, regular polygon sides=5,
draw=qfdcFrwS, fill=qfdcFrwS!40!white,
minimum size=5.5pt, inner sep=0pt, line width=0.8pt},
qfdalt5ln/.style={line width=0.7pt, dash dot dot, qfdcFrwS},
}
\begin{document}
\begin{qfdhouse}
% ---------- WHATs (left column) ----------
% Box width is 0.2 cm narrower than the column so labels have 0.1 cm
% clearance on each side and don't bleed into the Weight column.
\pgfmathsetmacro{\qfdWhatTextW}{\qfdWhatW - 0.2}
\foreach \r/\t in {%
1/{W1 Sub-second visible response to typing},
2/{W2 Publishing is one deliberate action away},
3/{W3 Pulling power never corrupts the file},
4/{W4 Provisioning never interrupts a writing session},
5/{W5 Quick boot to a writing cursor},
6/{W6 Long sessions without crash, lag, drift},
7/{W7 Nothing on the device competes with prose},
8/{W8 The UI never moves except when I move it},
9/{W9 Codebase absorbs the planned roadmap},
10/{W10 I can repair or fork it with hobbyist tools},
11/{W11 Multi-day battery life (v0.8 onward)},
12/{W12 Local-only files coexist with git scope (v0.5+)},
13/{W13 Typography sets a writing-tool tone},
14/{W14 I can carry the device and write away from a desk}%
}
\node[anchor=west, font=\scriptsize,
text width=\qfdWhatTextW cm, align=left]
at ({\qfdLeftEdge + 0.1}, {-\r + 0.5}) {\t};
% ---------- Importance (raw 1-10 weight) ----------
\foreach \r/\w in {1/10, 2/9, 3/10, 4/7, 5/6, 6/9, 7/8, 8/7,
9/8, 10/5, 11/4, 12/5, 13/7, 14/8}
\node[font=\scriptsize] at ({-\qfdImpW/2}, {-\r + 0.5}) {\w};
% ---------- HOWs (rotated column titles) ----------
\foreach \c/\t in {%
1/{H1 Type latency},
2/{H2 Refresh area per keystroke},
3/{H3 Full-refresh cadence},
4/{H4 Boot latency (cold)},
5/{H5 Continuous-typing endurance},
6/{H6 Publish reliability},
7/{H7 Publish latency},
8/{H8 Save durability},
9/{H9 PSRAM heap headroom},
10/{H10 Firmware binary size},
11/{H11 Total stack budget},
12/{H12 Network reconnect time},
13/{H13 Idle / typing / push current},
14/{H15 Clean release build time}%
}
\node[rotate=90, anchor=west, font=\scriptsize]
at ({\c - 0.5}, 0.15) {\t};
% ---------- Relation matrix (S=9, M=3, W=1) ----------
% W1 row 1: H1S H2S H3M H5M H9W H11W
\node[qfdrel/S] at ({1 - 0.5}, {-1 + 0.5}) {};
\node[qfdrel/S] at ({2 - 0.5}, {-1 + 0.5}) {};
\node[qfdrel/M] at ({3 - 0.5}, {-1 + 0.5}) {};
\node[qfdrel/M] at ({5 - 0.5}, {-1 + 0.5}) {};
\node[qfdrel/W] at ({9 - 0.5}, {-1 + 0.5}) {};
\node[qfdrel/W] at ({11 - 0.5}, {-1 + 0.5}) {};
% W2 row 2: H6S H7M H9S H12S
\node[qfdrel/S] at ({6 - 0.5}, {-2 + 0.5}) {};
\node[qfdrel/M] at ({7 - 0.5}, {-2 + 0.5}) {};
\node[qfdrel/S] at ({9 - 0.5}, {-2 + 0.5}) {};
\node[qfdrel/S] at ({12 - 0.5}, {-2 + 0.5}) {};
% W3 row 3: H8S
\node[qfdrel/S] at ({8 - 0.5}, {-3 + 0.5}) {};
% W4 row 4: H6M H12M
\node[qfdrel/M] at ({6 - 0.5}, {-4 + 0.5}) {};
\node[qfdrel/M] at ({12 - 0.5}, {-4 + 0.5}) {};
% W5 row 5: H4S H10M
\node[qfdrel/S] at ({4 - 0.5}, {-5 + 0.5}) {};
\node[qfdrel/M] at ({10 - 0.5}, {-5 + 0.5}) {};
% W6 row 6: H1M H3M H5S H6M H8M H9S H11M H12M
\node[qfdrel/M] at ({1 - 0.5}, {-6 + 0.5}) {};
\node[qfdrel/M] at ({3 - 0.5}, {-6 + 0.5}) {};
\node[qfdrel/S] at ({5 - 0.5}, {-6 + 0.5}) {};
\node[qfdrel/M] at ({6 - 0.5}, {-6 + 0.5}) {};
\node[qfdrel/M] at ({8 - 0.5}, {-6 + 0.5}) {};
\node[qfdrel/S] at ({9 - 0.5}, {-6 + 0.5}) {};
\node[qfdrel/M] at ({11 - 0.5}, {-6 + 0.5}) {};
\node[qfdrel/M] at ({12 - 0.5}, {-6 + 0.5}) {};
% W7 row 7: H1M H2M H3M H13M
\node[qfdrel/M] at ({1 - 0.5}, {-7 + 0.5}) {};
\node[qfdrel/M] at ({2 - 0.5}, {-7 + 0.5}) {};
\node[qfdrel/M] at ({3 - 0.5}, {-7 + 0.5}) {};
\node[qfdrel/M] at ({13 - 0.5}, {-7 + 0.5}) {};
% W8 row 8: H1W H2S H3S
\node[qfdrel/W] at ({1 - 0.5}, {-8 + 0.5}) {};
\node[qfdrel/S] at ({2 - 0.5}, {-8 + 0.5}) {};
\node[qfdrel/S] at ({3 - 0.5}, {-8 + 0.5}) {};
% W9 row 9: H10W H11W H15M
\node[qfdrel/W] at ({10 - 0.5}, {-9 + 0.5}) {};
\node[qfdrel/W] at ({11 - 0.5}, {-9 + 0.5}) {};
\node[qfdrel/M] at ({14 - 0.5}, {-9 + 0.5}) {};
% W10 row 10: H10M H13W H15W
\node[qfdrel/M] at ({10 - 0.5}, {-10 + 0.5}) {};
\node[qfdrel/W] at ({13 - 0.5}, {-10 + 0.5}) {};
\node[qfdrel/W] at ({14 - 0.5}, {-10 + 0.5}) {};
% W11 row 11: H13S
\node[qfdrel/S] at ({13 - 0.5}, {-11 + 0.5}) {};
% W12 row 12: H6W H8M
\node[qfdrel/W] at ({6 - 0.5}, {-12 + 0.5}) {};
\node[qfdrel/M] at ({8 - 0.5}, {-12 + 0.5}) {};
% W13 row 13: H9M
\node[qfdrel/M] at ({9 - 0.5}, {-13 + 0.5}) {};
% W14 row 14: H4W H8M H12M H13S
\node[qfdrel/W] at ({4 - 0.5}, {-14 + 0.5}) {};
\node[qfdrel/M] at ({8 - 0.5}, {-14 + 0.5}) {};
\node[qfdrel/M] at ({12 - 0.5}, {-14 + 0.5}) {};
\node[qfdrel/S] at ({13 - 0.5}, {-14 + 0.5}) {};
% ---------- Roof correlations ----------
\node[font=\scriptsize] at (C-1-2) {$+\!+$}; % H1-H2 strong reinforce
\node[font=\scriptsize] at (C-1-3) {$-$}; % H1-H3 mild conflict
\node[font=\scriptsize] at (C-1-5) {$+$}; % H1-H5 mild reinforce
\node[font=\scriptsize] at (C-1-13) {$-$}; % H1-H13 mild conflict
\node[font=\scriptsize] at (C-2-3) {$+\!+$}; % H2-H3 strong reinforce
\node[font=\scriptsize] at (C-2-13) {$+$}; % H2-H13
\node[font=\scriptsize] at (C-3-13) {$+$}; % H3-H13
\node[font=\scriptsize] at (C-4-10) {$-$}; % H4-H10 boot vs binary
\node[font=\scriptsize] at (C-5-6) {$+$}; % H5-H6
\node[font=\scriptsize] at (C-5-8) {$+$}; % H5-H8
\node[font=\scriptsize] at (C-5-9) {$-\!-$}; % H5-H9 soak vs heap
\node[font=\scriptsize] at (C-6-7) {$+$}; % H6-H7
\node[font=\scriptsize] at (C-6-9) {$-\!-$}; % H6-H9 push vs heap
\node[font=\scriptsize] at (C-6-12) {$+\!+$}; % H6-H12
\node[font=\scriptsize] at (C-7-9) {$-$}; % H7-H9
\node[font=\scriptsize] at (C-7-12) {$+\!+$}; % H7-H12
\node[font=\scriptsize] at (C-9-10) {$-\!-$}; % H9-H10 heap vs binary
\node[font=\scriptsize] at (C-10-14) {$-\!-$}; % H10-H15 binary vs build
\node[font=\scriptsize] at (C-11-13) {$-$}; % H11-H13
% ---------- Basement: target / abs weight / rel weight % ----------
\foreach \c/\tgt/\abs/\rel in {%
1/{$\leq$200\,ms}/148/10,
2/{$\leq$1 line}/177/11,
3/{1 : 64}/144/9,
4/{$\leq$5\,s}/62/4,
5/{$\geq$1\,h}/111/7,
6/{$\geq$95\,\%}/134/9,
7/{$\leq$30\,s}/27/2,
8/{100\,\%}/156/10,
9/{$\geq$1\,MB}/193/12,
10/{$\leq$2\,MB}/41/3,
11/{$\leq$80\,KB}/45/3,
12/{$\leq$30\,s}/153/10,
13/{obs.}/137/9,
14/{$\leq$7\,min}/29/2%
} {
\node[font=\scriptsize] at ({\c - 0.5}, {-\qfdNW - 0.5}) {\tgt};
\node[font=\scriptsize] at ({\c - 0.5}, {-\qfdNW - 1.5}) {\abs};
\node[font=\scriptsize\bfseries]
at ({\c - 0.5}, {-\qfdNW - 2.5}) {\rel};
}
% ---------- Basement row labels (in the margin below WHATs) ----------
\foreach \k/\lbl in {1/{Target (v0.1)}, 2/{$\Sigma$ abs}, 3/{Rel.\ \%}}
\node[anchor=east, font=\scriptsize\itshape]
at ({-0.1}, {-\qfdNW - \k + 0.5}) {\lbl};
% ---------- Perception zone: 5 products x 14 WHATs (0-5 scores) ----------
% Columns: \so=Typoena target, \st=reMarkable 2 + Type Folio,
% \sf=Freewrite Traveler, \sg=Pomera DM250,
% \sh=Freewrite Smart Typewriter.
% Pass 1: stash each score as a named coordinate so the profile lines
% below can reuse it without recomputing.
\foreach \r/\so/\st/\sf/\sg/\sh in {%
1/4/1/4/5/3,
2/5/4/4/2/4,
3/4/4/2/2/2,
4/5/2/2/5/2,
5/4/3/4/5/4,
6/3/3/4/5/4,
7/5/2/5/5/5,
8/4/3/4/5/4,
9/4/3/2/1/2,
10/5/4/2/1/2,
11/1/5/5/4/5,
12/3/1/2/3/2,
13/3/5/2/2/2,
14/2/4/5/2/5%
} {
\pgfmathsetmacro{\xo}{\qfdNH + (\so + 0.5)*\qfdCmpW/6}
\pgfmathsetmacro{\xt}{\qfdNH + (\st + 0.5)*\qfdCmpW/6}
\pgfmathsetmacro{\xf}{\qfdNH + (\sf + 0.5)*\qfdCmpW/6}
\pgfmathsetmacro{\xg}{\qfdNH + (\sg + 0.5)*\qfdCmpW/6}
\pgfmathsetmacro{\xs}{\qfdNH + (\sh + 0.5)*\qfdCmpW/6}
\coordinate (po-\r) at (\xo, {-\r + 0.5});
\coordinate (pr-\r) at (\xt, {-\r + 0.5});
\coordinate (pf-\r) at (\xf, {-\r + 0.5});
\coordinate (pp-\r) at (\xg, {-\r + 0.5});
\coordinate (ps-\r) at (\xs, {-\r + 0.5});
}
% Pass 2: profile lines per alternative. Drawn before markers so the
% dots sit on top of (not under) the line endpoints.
\draw[qfdalt1ln] (po-1) \foreach \r in {2,...,\qfdNW} { -- (po-\r) };
\draw[qfdalt2ln] (pr-1) \foreach \r in {2,...,\qfdNW} { -- (pr-\r) };
\draw[qfdalt3ln] (pf-1) \foreach \r in {2,...,\qfdNW} { -- (pf-\r) };
\draw[qfdalt4ln] (pp-1) \foreach \r in {2,...,\qfdNW} { -- (pp-\r) };
\draw[qfdalt5ln] (ps-1) \foreach \r in {2,...,\qfdNW} { -- (ps-\r) };
% Pass 3: markers on top of the lines.
\foreach \r in {1,...,\qfdNW} {
\node[qfdalt1mk] at (po-\r) {};
\node[qfdalt2mk] at (pr-\r) {};
\node[qfdalt3mk] at (pf-\r) {};
\node[qfdalt4mk] at (pp-\r) {};
\node[qfdalt5mk] at (ps-\r) {};
}
% ---------- Manual legend (5 alternatives, placed right of zones) ----------
\pgfmathsetmacro{\qfdLegX}{\qfdNH + \qfdCmpW + 0.7}
\begin{scope}[shift={(\qfdLegX, \qfdHdrH - 0.4)}]
\draw[qfdmed, rounded corners=2pt]
(-0.15, 0.4) rectangle (5.1, -7.50);
% Relations
\node[anchor=west, font=\footnotesize\bfseries] at (0, 0.1)
{Relation};
\draw[qfdthin] (0, -0.15) -- (4.95, -0.15);
\node[qfdstrong] at (0.22, -0.5) {};
\node[anchor=west] at (0.5, -0.5) {Strong (9)};
\node[qfdmod] at (0.22, -0.95) {};
\node[anchor=west] at (0.5, -0.95) {Medium (3)};
\node[qfdweak] at (0.22, -1.4) {};
\node[anchor=west] at (0.5, -1.4) {Weak (1)};
% Correlation
\node[anchor=west, font=\footnotesize\bfseries] at (0, -2.10)
{Correlation};
\draw[qfdthin] (0, -2.35) -- (4.95, -2.35);
\node[anchor=west] at (0, -2.70) {{$+\!+$}\quad very positive};
\node[anchor=west] at (0, -3.05) {{$+$\phantom{$+$}}\quad positive};
\node[anchor=west] at (0, -3.40) {{$-$\phantom{$-$}}\quad negative};
\node[anchor=west] at (0, -3.75) {{$-\!-$}\quad very negative};
% Perception
\node[anchor=west, font=\footnotesize\bfseries] at (0, -4.20)
{Perception};
\draw[qfdthin] (0, -4.45) -- (4.95, -4.45);
\draw[qfdalt1ln] (0.05, -4.80) -- (0.45, -4.80);
\node[qfdalt1mk] at (0.25, -4.80) {};
\node[anchor=west, font=\bfseries] at (0.55, -4.80)
{Typoena (v0.1 target)};
\draw[qfdalt2ln] (0.05, -5.25) -- (0.45, -5.25);
\node[qfdalt2mk] at (0.25, -5.25) {};
\node[anchor=west] at (0.55, -5.25) {reMarkable 2 + Type Folio};
\draw[qfdalt3ln] (0.05, -5.70) -- (0.45, -5.70);
\node[qfdalt3mk] at (0.25, -5.70) {};
\node[anchor=west] at (0.55, -5.70) {Freewrite Traveler};
\draw[qfdalt5ln] (0.05, -6.15) -- (0.45, -6.15);
\node[qfdalt5mk] at (0.25, -6.15) {};
\node[anchor=west] at (0.55, -6.15) {Freewrite Smart Typewriter};
\draw[qfdalt4ln] (0.05, -6.60) -- (0.45, -6.60);
\node[qfdalt4mk] at (0.25, -6.60) {};
\node[anchor=west] at (0.55, -6.60) {Pomera DM250};
\node[anchor=west, font=\scriptsize\itshape] at (0, -7.15)
{0 = poor, 5 = excellent};
\end{scope}
\end{qfdhouse}
\end{document}
Perception scores (guessed)
Five products on the 0–5 scale, scored against each WHAT. Reference
configurations: reMarkable 2 + Type Folio, Freewrite Traveler,
Freewrite Smart Typewriter, Pomera DM250 (DM250 has a reflective
monochrome LCD, not e-ink — flagged in W1 / W8). "Typoena" is the v0.1
target from qfd.md §2, not measured yet.
Freewrite Traveler scores assume the Sailfish firmware (released 2025-11-19), which rewrote the OS in Rust, cut keystroke latency 40–100 %, and trimmed power draw −30 % typing / −50 % idle on both Traveler and Smart Typewriter Gen 3. Three rows rescored upward as a result: W1 Traveler 3→4 / Smart 2→3 (Smart's larger panel still trails Traveler by one notch), W5 both 3→4 (boot accelerated, no published number), W9 both 1→2 (Rust rewrite explicitly unblocked features that JS could not carry; still closed so neither reaches reMarkable's hackable-Linux 3).
| ID | WHAT (truncated) | Typoena | reM. | Frw.T | Frw.S | Pom. | Rationale (shortest defensible) |
|---|---|---|---|---|---|---|---|
| W1 | Sub-second response to typing | 4 | 1 | 4 | 3 | 5 | Typoena targets ≤200 ms; reMarkable e-ink visibly laggy on a typing-focused device — tested less responsive than Smart Typewriter, and latency is so load-bearing for W1 that it earns a 1 not a 2; both Freewrites post-Sailfish trimmed latency 40–100 % (Frw.T plausibly inside 200 ms; Frw.S still trails by one notch on larger panel); Pomera LCD ~zero. |
| W2 | Publishing is one deliberate action away | 5 | 4 | 4 | 4 | 2 | Ctrl-G atomic; reMarkable + Freewrite cloud-sync is one-tap but not git; Pomera = USB/SD copy or QR transfer. |
| W3 | Pulling power never corrupts the file | 4 | 4 | 2 | 2 | 2 | Typoena: atomic-rename + fsync. reMarkable journals. Freewrite + Pomera: forum reports of corruption on yank. |
| W4 | Provisioning never interrupts writing | 5 | 2 | 2 | 2 | 5 | Typoena v0.1: build-time config (dev-only). reM/Frw need Wi-Fi + account. Pomera: literally none. |
| W5 | Quick boot to a writing cursor | 4 | 3 | 4 | 4 | 5 | Typoena target ≤5 s. reMarkable cold-boots ~20 s (great from sleep). Both Freewrites accelerated post-Sailfish (no published number; were ~10–15 s e-ink wake). Pomera ~3 s. |
| W6 | Long sessions without crash / lag / drift | 3 | 3 | 4 | 4 | 5 | Typoena unproven (1 h target). Freewrite famously stable (both variants). Pomera firmware is decades-mature. |
| W7 | Nothing on the device competes with prose | 5 | 2 | 5 | 5 | 5 | reMarkable has apps, menus, drawing, PDFs. Freewrite + Pomera are single-purpose; Typoena by design. |
| W8 | The UI never moves except when I move it | 4 | 3 | 4 | 4 | 5 | reMarkable animates more; Typoena uses dirty-rects; Freewrites minimal motion; Pomera near-static LCD. |
| W9 | Codebase absorbs the planned roadmap | 4 | 3 | 2 | 2 | 1 | Modular Rust Typoena; reMarkable is hackable Linux; both Freewrites carry Sailfish (Rust rewrite explicitly unblocked features JS could not carry) but closed; Pomera closed firmware. |
| W10 | I can repair or fork it with hobbyist tools | 5 | 4 | 2 | 2 | 1 | Typoena: open BOM + ESP32. reMarkable: rooted Linux + community ROMs. Freewrite + Pomera: closed. |
| 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. |
| 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. |
| 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. |
| 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. |
Totals (sum across 14 WHATs, no weighting): Typoena 52, Pomera 50,
Freewrite Traveler 47, reMarkable 44, Freewrite Smart Typewriter 42
(Traveler pre-Sailfish 44; Smart pre-Sailfish 39; reMarkable W1 dropped
3→2→1 across two rounds of author testing — first to 2 after firsthand
typing, then to 1 once latency was recognised as the dominant W1
signal). Pomera closing to within 2 of
Typoena is W14 doing what W14 should — surfacing the dimension on
which v0.1's tethered MVP loses ground that v0.8 is expected to
recover. The "Pomera + Wi-Fi + git + hackable BOM" framing from
README.md still holds and reads stronger.
Weighted totals (Σ score × W weight) tell the same story with more contrast — left as exercise; the unweighted view is enough to read the picture.
Caveats
- Single-rater bias. All thirteen rows are scored from the project author's POV. A reMarkable buyer would weight W11 (battery) at 10 and W12 (git) at 1, flipping the totals.
- Configuration matters. Freewrite Smart Typewriter and Traveler are both tracked; they diverge most on W1 / W5 because of display tech (Smart's larger panel is slower to refresh). Traveler is still the more direct competitor on form factor.
- W3 / W6 Freewrite scores are anecdotal. Forum reports, not bench data. Treat the 2 / 4 as "we'd need to test this" rather than fact.
- No price column. Typoena-as-BOM is materially cheaper than the
competitors but cost is not a WHAT in
qfd.md§1, so it's absent here. Worth a row if a v0.x WHAT ever calls it out.
Reading the house
- Importance (left column) is the raw 1–10 weight from
qfd.md§1, not a normalised %, so adding stays cheap when a WHAT shifts. Sum of weights is 103; treat each unit as ~0.97 % if you want a percentage view. - Roof carries the §4 symbols translated into classical QFD glyphs:
++strong reinforcement (◎),+mild reinforcement (○),−mild conflict (×),−−strong conflict (⊗). - Basement rows are: v0.1 target → §3 column sum (
Σofweight × strength) → relative weight as integer % of total (1557). Relative weights round to 100. - H7, H10, H15 (Publish latency, binary size, build time) sit at the bottom
of the basement — knowingly-paid costs per
qfd.md§7, not signals to optimise harder.
Regenerating
The matrix cells (\node[qfdrel/{S,M,W}]), roof symbols (C-i-j slots),
and basement Σ + Rel% are native to this file — re-score directly in the
TikZ source, then update the §3 priority list and §4 conflict list in
qfd.md to match the new picture.
When qfd.md §1 or §2 changes:
- Importance column → §1 weight column.
- HOW titles + v0.1 targets → §2 target column.
- Recompute basement Σ for any HOW whose column changed: per-cell
contribution =
(W weight) × (cell strength: 9 / 3 / 1 / 0). - Recompute relative weight: each Σ ÷ total Σ × 100, rounded to integer percent.
Perception scores are not derived from qfd.md — they live only in
this file. Update them when (a) a competitor ships a relevant change,
(b) measurement replaces a guess, or (c) a WHAT is added/removed in §1.
Each score keeps its one-line rationale in the table above.
If a renderer rejects the tikz fence, the file is still readable as
source — the placement comments name each WHAT, HOW, and cell. The
perception-scores table above is the human-readable fallback for the
right-hand zone of the diagram.