docs: add QFD House 2 (functions × components) with roof and basement
This commit is contained in:
Julien Calixte
369
DESIGN.md
369
DESIGN.md
@@ -429,6 +429,375 @@ Function → Component strength (9/3/1/blank):
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_F5's deferred SSO short-link redirector would later attach to **C4**._
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### House 2 — Functions × Components
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Functions (House 1's HOWs) are now the WHATs, down the left with their carried-down
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weights; components are the HOWs across the top. Roof = component↔component
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correlation; basement = per-component target, build difficulty, and weight.
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<!-- Self-contained: this ```tikz fence compiles independently, so it repeats
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House 1's template preamble verbatim; only the overrides + body below differ. -->
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```tikz
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\usetikzlibrary{arrows.meta, positioning, shapes.geometric, shapes.misc, calc, fit, backgrounds}
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% Toggles
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\newif\ifqfdshowroof \qfdshowrooftrue
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\newif\ifqfdshowbasement \qfdshowbasementtrue
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\newif\ifqfdshowcompetitive \qfdshowcompetitivetrue
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\newif\ifqfdshowlegend \qfdshowlegendtrue
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\newif\ifqfdshowimportance \qfdshowimportancetrue
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\newif\ifqfdshowcorrlegend \qfdshowcorrlegendtrue
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\newif\ifqfdshowevallegend \qfdshowevallegendtrue
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\newif\ifqfdshowtitle \qfdshowtitletrue
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% Dimensions
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\def\qfdNW{5}
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\def\qfdNH{5}
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\def\qfdWhatW{4.0}
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\def\qfdImpW{0.9}
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\def\qfdCmpW{3}
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\def\qfdHdrH{2.6}
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\def\qfdBasementN{4}
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% Titles & labels
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\def\qfdWhatsTitle{Customer needs}
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\def\qfdImpTitle{Imp.\ \%}
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\def\qfdPerceptionTitle{Comparative evaluation}
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\def\qfdPoorLabel{poor}
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\def\qfdExcellentLabel{excellent}
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\def\qfdAltOneLabel{Our product}
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\def\qfdAltTwoLabel{Competitor A}
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\def\qfdAltThreeLabel{Competitor B}
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\def\qfdRelTitle{Relation}
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\def\qfdCorrTitle{Correlation}
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\def\qfdEvalTitle{Evaluation}
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\def\qfdProjectTitle{}
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\def\qfdConcept{}
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% Styles
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\tikzset{
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qfdthin/.style ={line width=0.35pt},
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qfdmed/.style ={line width=0.7pt},
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qfdstrong/.style={circle, draw, fill=black,
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minimum size=7pt, inner sep=0pt},
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qfdmod/.style ={circle, draw,
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minimum size=7pt, inner sep=0pt, line width=0.8pt},
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qfdweak/.style ={regular polygon, regular polygon sides=3, draw,
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minimum size=8.5pt, inner sep=0pt, line width=0.7pt},
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qfdrel/.is choice,
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qfdrel/S/.style={qfdstrong},
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qfdrel/M/.style={qfdmod},
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qfdrel/W/.style={qfdweak},
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qfdalt1mk/.style={circle, draw, fill=black,
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minimum size=6pt, inner sep=0pt, line width=1pt},
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qfdalt1ln/.style={line width=1.2pt},
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qfdalt2mk/.style={regular polygon, regular polygon sides=3, draw,
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fill=black, minimum size=6pt, inner sep=0pt,
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line width=0.7pt},
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qfdalt2ln/.style={line width=0.7pt, dashed},
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qfdalt3mk/.style={rectangle, draw, fill=black,
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minimum size=5pt, inner sep=0pt, line width=0.7pt},
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qfdalt3ln/.style={line width=0.7pt, dotted},
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}
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\newcommand{\qfdDrawGrid}{%
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\foreach \c in {1,...,\qfdNHm} \draw[qfdthin] (\c, 0) -- (\c, -\qfdNW);
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\foreach \r in {1,...,\qfdNWm} \draw[qfdthin] (0, -\r) -- (\qfdNH, -\r);
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\foreach \r in {1,...,\qfdNWm}
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\draw[qfdthin] (\qfdLeftEdge, -\r) -- (0, -\r);
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\ifqfdshowroof
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\foreach \c in {1,...,\qfdNHm}
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\draw[qfdthin] (\c, 0) -- (\c, \qfdHdrH);
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\fi
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\ifqfdshowcompetitive
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\foreach \r in {1,...,\qfdNWm}
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\draw[qfdthin] (\qfdNH, -\r) -- (\qfdNH+\qfdCmpW, -\r);
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\fi
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\ifqfdshowbasement
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\foreach \r in {1,...,\qfdBasementN}
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\draw[qfdthin] (0, -\qfdNW-\r) -- (\qfdNH, -\qfdNW-\r);
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\foreach \c in {1,...,\qfdNHm}
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\draw[qfdthin] (\c, -\qfdNW) -- (\c, -\qfdNW-\qfdBasementN);
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\fi
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}
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\newcommand{\qfdDrawRoof}{%
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\ifqfdshowroof
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\foreach \k in {1,...,\qfdNHm} {%
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\pgfmathsetmacro{\rx}{(\k+\qfdNH)/2}
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\pgfmathsetmacro{\ry}{\qfdHdrH + (\qfdNH-\k)/2}
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\pgfmathsetmacro{\lx}{\k/2}
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\pgfmathsetmacro{\ly}{\qfdHdrH + \k/2}
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\draw[qfdthin] (\k, \qfdHdrH) -- (\rx, \ry);
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\draw[qfdthin] (\k, \qfdHdrH) -- (\lx, \ly);
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}%
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\draw[qfdmed] (0, \qfdHdrH)
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-- (\qfdNH/2, \qfdApexY) -- (\qfdNH, \qfdHdrH);
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\foreach \i in {1,...,\qfdNH}
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\foreach \k in {1,...,\qfdNH} {%
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\pgfmathtruncatemacro{\jj}{\i+\k}
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\ifnum\jj>\qfdNH\relax\else
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\pgfmathsetmacro{\xx}{\i + \k/2 - 0.5}
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\pgfmathsetmacro{\yy}{\qfdHdrH + \k/2}
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\coordinate (C-\i-\jj) at (\xx, \yy);
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\fi
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}%
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\fi
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}
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\newcommand{\qfdDrawScale}{%
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\ifqfdshowcompetitive
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\foreach \tk in {0,1,2,3,4,5} {%
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\pgfmathsetmacro{\tx}{\qfdNH + (\tk+0.5)*\qfdCmpW/6}
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\node[anchor=south, font=\scriptsize] at (\tx, 0.02) {\tk};
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}%
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\node[anchor=south, font=\scriptsize\bfseries, align=center]
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at ({\qfdNH + \qfdCmpW/2}, 0.7) {\qfdPerceptionTitle};
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\node[anchor=north, font=\scriptsize\itshape]
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at ({\qfdNH + 0.45}, -\qfdNW) {\qfdPoorLabel};
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\node[anchor=north, font=\scriptsize\itshape]
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at ({\qfdNH + \qfdCmpW - 0.45}, -\qfdNW) {\qfdExcellentLabel};
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\fi
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}
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\newcommand{\qfdDrawZoneTitles}{%
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\ifqfdshowimportance
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\node[rotate=90, anchor=west, font=\footnotesize\bfseries]
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at ({-\qfdImpW/2}, 0.12) {\qfdImpTitle};
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\fi
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\node[font=\scriptsize\bfseries, align=center, text width=\qfdWhatW cm]
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at ({\qfdLeftEdge + \qfdWhatW/2},
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{\ifqfdshowroof \qfdHdrH/2 \else 0.6 \fi}) {\qfdWhatsTitle};
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}
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\newcommand{\qfdDrawTitle}{%
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\ifqfdshowtitle
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\ifx\qfdProjectTitle\empty\else
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\pgfmathsetmacro{\qfdTitleX}{\qfdNH/2}
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\pgfmathsetmacro{\qfdTitleY}{\ifqfdshowroof \qfdApexY \else \qfdHdrH \fi + 0.9}
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\pgfmathsetmacro{\qfdSubW}{\qfdNH + 2}
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\node[anchor=south, font=\large\bfseries, align=center]
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at (\qfdTitleX, \qfdTitleY) {\qfdProjectTitle};
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\ifx\qfdConcept\empty\else
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\node[anchor=north, font=\footnotesize\itshape, align=center,
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text width=\qfdSubW cm]
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at (\qfdTitleX, {\qfdTitleY - 0.1}) {\qfdConcept};
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\fi
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\fi
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\fi
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}
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\newcommand{\qfdDrawFrames}{%
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\begin{scope}[qfdmed]
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\draw (\qfdLeftEdge, 0) rectangle (\qfdNH, -\qfdNW);
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\ifqfdshowimportance \draw (-\qfdImpW, 0) -- (-\qfdImpW, -\qfdNW); \fi
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\draw (0, 0) -- (0, -\qfdNW);
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\ifqfdshowroof
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\draw (0, 0) rectangle (\qfdNH, \qfdHdrH); \fi
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\ifqfdshowbasement
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\draw (0, -\qfdNW) rectangle (\qfdNH, -\qfdNW-\qfdBasementN); \fi
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\ifqfdshowcompetitive
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\draw (\qfdNH, 0) rectangle (\qfdNH+\qfdCmpW, -\qfdNW); \fi
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\end{scope}
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}
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\newcommand{\qfdDrawLegend}{%
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\ifqfdshowlegend
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\pgfmathsetmacro{\qfdLegX}{%
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\qfdNH + \ifqfdshowcompetitive \qfdCmpW + 0.7 \else 0.7 \fi}
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\pgfmathsetmacro{\qfdLegBottom}{%
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-2.05
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\ifqfdshowroof \ifqfdshowcorrlegend - 2.55 \fi \fi
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\ifqfdshowcompetitive \ifqfdshowevallegend - 2.20 \fi \fi}
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\pgfmathsetmacro{\qfdLegY}{\qfdHdrH - 0.4}
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\begin{scope}[shift={(\qfdLegX, \qfdLegY)}]
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\draw[qfdmed, rounded corners=2pt]
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(-0.15, 0.4) rectangle (4.5, \qfdLegBottom);
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\node[anchor=west, font=\footnotesize\bfseries] at (0, 0.1)
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{\qfdRelTitle};
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\draw[qfdthin] (0, -0.15) -- (4.35, -0.15);
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\node[qfdstrong] at (0.22, -0.5) {};
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\node[anchor=west] at (0.5, -0.5) {Strong (9)};
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\node[qfdmod] at (0.22, -0.95) {};
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\node[anchor=west] at (0.5, -0.95) {Medium (3)};
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\node[qfdweak] at (0.22, -1.4) {};
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\node[anchor=west] at (0.5, -1.4) {Weak (1)};
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\ifqfdshowroof \ifqfdshowcorrlegend
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\node[anchor=west, font=\footnotesize\bfseries] at (0, -2.10)
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{\qfdCorrTitle};
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\draw[qfdthin] (0, -2.35) -- (4.35, -2.35);
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\node[anchor=west] at (0, -2.70) {{$+\!+$}\quad very positive};
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\node[anchor=west] at (0, -3.05) {{$+$\phantom{$+$}}\quad positive};
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\node[anchor=west] at (0, -3.40) {{$-$\phantom{$-$}}\quad negative};
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\node[anchor=west] at (0, -3.75) {{$-\!-$}\quad very negative};
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\fi \fi
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\ifqfdshowcompetitive \ifqfdshowevallegend
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\pgfmathsetmacro{\qfdEvalTop}{%
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-2.10 \ifqfdshowroof\ifqfdshowcorrlegend - 2.55 \fi\fi}
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\node[anchor=west, font=\footnotesize\bfseries]
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at (0, \qfdEvalTop) {\qfdEvalTitle};
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\pgfmathsetmacro{\qfdEvalSep}{\qfdEvalTop - 0.25}
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\draw[qfdthin] (0, \qfdEvalSep) -- (4.35, \qfdEvalSep);
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\pgfmathsetmacro{\qfdLegA}{\qfdEvalTop - 0.55}
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\draw[qfdalt1ln] (0.05, \qfdLegA) -- (0.45, \qfdLegA);
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\node[qfdalt1mk] at (0.25, \qfdLegA) {};
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\node[anchor=west, font=\bfseries] at (0.55, \qfdLegA)
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{\qfdAltOneLabel};
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\pgfmathsetmacro{\qfdLegB}{\qfdEvalTop - 0.95}
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\draw[qfdalt2ln] (0.05, \qfdLegB) -- (0.45, \qfdLegB);
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\node[qfdalt2mk] at (0.25, \qfdLegB) {};
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\node[anchor=west] at (0.55, \qfdLegB) {\qfdAltTwoLabel};
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\pgfmathsetmacro{\qfdLegC}{\qfdEvalTop - 1.35}
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\draw[qfdalt3ln] (0.05, \qfdLegC) -- (0.45, \qfdLegC);
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\node[qfdalt3mk] at (0.25, \qfdLegC) {};
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\node[anchor=west] at (0.55, \qfdLegC) {\qfdAltThreeLabel};
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\fi \fi
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\end{scope}
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\fi
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}
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\newenvironment{qfdhouse}{%
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\begin{tikzpicture}[x=1cm, y=1cm, font=\scriptsize,
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line cap=round, line join=round]
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\ifqfdshowimportance
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\pgfmathsetmacro{\qfdLeftEdge}{-\qfdWhatW-\qfdImpW}
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\else
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\pgfmathsetmacro{\qfdLeftEdge}{-\qfdWhatW}
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\fi
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\pgfmathsetmacro{\qfdApexY}{\qfdHdrH + \qfdNH/2}
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\pgfmathtruncatemacro{\qfdNHm}{\qfdNH - 1}
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\pgfmathtruncatemacro{\qfdNWm}{\qfdNW - 1}
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\qfdDrawGrid
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\qfdDrawRoof
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\qfdDrawScale
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\qfdDrawZoneTitles
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\qfdDrawTitle
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}{%
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\qfdDrawFrames
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\qfdDrawLegend
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\end{tikzpicture}%
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}
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% ---- Overrides for House 2 (Functions × Components) ----
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\def\qfdNW{5}
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\def\qfdNH{6}
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\def\qfdWhatW{4.7}
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\def\qfdHdrH{3.2}
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\def\qfdImpTitle{Weight}
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\def\qfdWhatsTitle{Functions (WHATs)}
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\def\qfdProjectTitle{Dantotsu Print — House 2}
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\def\qfdConcept{Functions (the HOWs of House 1) realised by concrete \textbf{components}.}
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\qfdshowcompetitivefalse
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\begin{document}
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\begin{qfdhouse}
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% WHATs (Functions) + carried-down weights (House 1 relative weights)
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\pgfmathsetmacro{\qfdWhatTextW}{\qfdWhatW - 0.2}
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\foreach \r/\t in {1/{F1 Minimise capture effort},
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2/{F2 Fidelity \& legibility},
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3/{F3 Scope to the cell},
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4/{F4 Minimise operating burden},
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5/{F5 Durable back-link}}
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\node[anchor=west, font=\scriptsize, text width=\qfdWhatTextW cm, align=left]
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at ({\qfdLeftEdge + 0.1}, {-\r + 0.5}) {\t};
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\foreach \r/\imp in {1/26, 2/26, 3/9, 4/24, 5/16}
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\node[font=\scriptsize] at ({-\qfdImpW/2}, {-\r + 0.5}) {\imp};
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% HOWs (Components)
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\foreach \c/\t in {1/{C1 CLI engine}, 2/{C2 Keystroke shims},
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3/{C3 Renderer}, 4/{C4 Print service},
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5/{C5 Label printer}, 6/{C6 Board registry}}
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\node[rotate=90, anchor=west, font=\scriptsize] at ({\c - 0.5}, 0.15) {\t};
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% Relations (Function x Component, from the section 6 matrix)
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\node[qfdrel/S] at ({1 - 0.5}, {-1 + 0.5}) {}; % F1-C1
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\node[qfdrel/S] at ({2 - 0.5}, {-1 + 0.5}) {}; % F1-C2
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\node[qfdrel/M] at ({6 - 0.5}, {-1 + 0.5}) {}; % F1-C6
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\node[qfdrel/M] at ({1 - 0.5}, {-2 + 0.5}) {}; % F2-C1
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\node[qfdrel/S] at ({3 - 0.5}, {-2 + 0.5}) {}; % F2-C3
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\node[qfdrel/S] at ({1 - 0.5}, {-3 + 0.5}) {}; % F3-C1
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\node[qfdrel/M] at ({3 - 0.5}, {-3 + 0.5}) {}; % F3-C3
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\node[qfdrel/S] at ({4 - 0.5}, {-4 + 0.5}) {}; % F4-C4
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\node[qfdrel/S] at ({5 - 0.5}, {-4 + 0.5}) {}; % F4-C5
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\node[qfdrel/M] at ({6 - 0.5}, {-4 + 0.5}) {}; % F4-C6
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\node[qfdrel/S] at ({1 - 0.5}, {-5 + 0.5}) {}; % F5-C1
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\node[qfdrel/W] at ({4 - 0.5}, {-5 + 0.5}) {}; % F5-C4
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% Roof correlations (Component x Component)
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\node[font=\scriptsize] at (C-1-2) {$+\!+$}; % C1-C2 shims wrap the CLI
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\node[font=\scriptsize] at (C-1-3) {$+\!+$}; % C1-C3 renderer in the CLI
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\node[font=\scriptsize] at (C-1-4) {$+$}; % C1-C4 CLI POSTs to service
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\node[font=\scriptsize] at (C-1-6) {$+$}; % C1-C6 CLI reads --board
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\node[font=\scriptsize] at (C-3-4) {$+$}; % C3-C4 service transports raster
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\node[font=\scriptsize] at (C-3-5) {$-$}; % C3-C5 mono printer caps renderer
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\node[font=\scriptsize] at (C-4-5) {$+\!+$}; % C4-C5 service drives printer
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\node[font=\scriptsize] at (C-4-6) {$+\!+$}; % C4-C6 registry lives in service
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\node[font=\scriptsize] at (C-5-6) {$+$}; % C5-C6 registry maps board->printer
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% Basement row labels
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\node[anchor=west, font=\scriptsize] at ({\qfdLeftEdge + 0.1}, {-\qfdNW - 0.5}) {Target};
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\node[anchor=west, font=\scriptsize] at ({\qfdLeftEdge + 0.1}, {-\qfdNW - 1.5}) {Difficulty (1--5)};
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\node[anchor=west, font=\scriptsize] at ({\qfdLeftEdge + 0.1}, {-\qfdNW - 2.5}) {Abs.\ weight};
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\node[anchor=west, font=\scriptsize] at ({\qfdLeftEdge + 0.1}, {-\qfdNW - 3.5}) {Rel.\ weight \%};
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% Basement values
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\foreach \c/\tgt/\diff/\abs/\rel in
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{1/{$\leq$1 s}/4/537/33,
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2/{4 eds}/2/234/14,
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3/{300 dpi}/4/261/16,
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4/{route}/3/232/14,
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5/{102 mm}/1/216/13,
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6/{board}/2/150/9} {
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\node[font=\scriptsize] at ({\c - 0.5}, {-\qfdNW - 0.5}) {\tgt};
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\node[font=\scriptsize] at ({\c - 0.5}, {-\qfdNW - 1.5}) {\diff};
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\node[font=\scriptsize] at ({\c - 0.5}, {-\qfdNW - 2.5}) {\abs};
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\node[font=\scriptsize\bfseries] at ({\c - 0.5}, {-\qfdNW - 3.5}) {\rel};
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}
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\end{qfdhouse}
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\end{document}
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```
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**Reading it.** **C1 (33%)** dominates — it realises four of five functions; it is
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the hub, and with **C3 (16%)** carries the build risk (both Difficulty 4). C2/C4/C5
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cluster ~13–14%, C6 trails at 9%. Effort should track weight.
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#### House 2 roof — Component × Component
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`◎` strong reinforce · `○` mild reinforce · `×` mild conflict.
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| | C1 | C2 | C3 | C4 | C5 | C6 |
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||||
|--------|:--:|:--:|:--:|:--:|:--:|:--:|
|
||||
| **C1** | — | ◎ | ◎ | ○ | | ○ |
|
||||
| **C2** | | — | | | | |
|
||||
| **C3** | | | — | ○ | × | |
|
||||
| **C4** | | | | — | ◎ | ◎ |
|
||||
| **C5** | | | | | — | ○ |
|
||||
| **C6** | | | | | | — |
|
||||
|
||||
- **C1×C2 (◎), C1×C3 (◎)** — the shims are thin wrappers that invoke the CLI, and the renderer is a library inside it; building the CLI *is* building the seat these sit in.
|
||||
- **C4×C5 (◎), C4×C6 (◎)** — the print service drives the printer via `brother_ql` and owns the board→printer registry; one coherent server.
|
||||
- **C3×C5 (×) — the one conflict.** A richer renderer is capped by the monochrome ≥300 dpi / 102 mm label: hue and fine detail C3 *could* produce don't survive the print. This is **T2** (§8) made structural — spend renderer effort on legible monochrome, not colour.
|
||||
- **Mild reinforces (○):** C1×C4 (CLI POSTs the card), C1×C6 (CLI reads `--board` to route), C3×C4 (service transports C3's raster — they must agree on its spec), C5×C6 (registry maps board→printer IP).
|
||||
|
||||
_Watched, not a roof conflict: **C1 (Rust) ↔ C4 (Python)** cooperate to print, but the two runtimes couple across an HTTP contract that must not drift — see **T6** (§8)._
|
||||
|
||||
#### House 2 basement — component performance budget
|
||||
|
||||
_Abs./Rel. weight are **computed** — §6 matrix × carried-down function weights
|
||||
(F1 26, F2 26, F3 9, F4 24, F5 16). **Target** and **Difficulty** are a first
|
||||
assessment introduced with this house; revise as ADRs/spikes land._
|
||||
|
||||
| Component | Target (now) | Difficulty | Abs. | Rel. % |
|
||||
|-----------|--------------|:----------:|:----:|:------:|
|
||||
| C1 CLI engine | single static binary; cold run ≤ ~1 s to emit | 4 | 537 | **33** |
|
||||
| C3 Renderer | verbatim mono PNG at 90×85 mm, ~48c×19r @ 8 pt, crisp @300 dpi, span marks | 4 | 261 | **16** |
|
||||
| C2 Keystroke shims| one map per editor (Vim/JetBrains/VS Code·Cursor); Xcode clipboard | 2 | 234 | **14** |
|
||||
| C4 Print service | board→printer route + retries + status; service up | 3 | 232 | **14** |
|
||||
| C5 Label printer | Brother QL-1110NWB, 102 mm, ≥300 dpi, removable, networked | 1 | 216 | **13** |
|
||||
| C6 Board registry | `--board` + per-repo/dev default; board→printer map | 2 | 150 | **9** |
|
||||
|
||||
## 7. Critical performance budget
|
||||
|
||||
Ranked from §4 importance and §5 conflicts. `If we miss it` is mandatory — a target without a fallback is a wish.
|
||||
|
||||
Reference in New Issue
Block a user