[Style] fixes

collects/scribblings/style/correct-maintain-speed.scrbl

@@ -13,7 +13,6 @@ Code is maintainable.
 
 Code is fast.
 
-The following suggestions are about creating maintainable and fast
-code. The production of correct code is a project for life, and depends to
-a high degree on reflection---i.e., thinking about what you are doing and
-not just doing it.
+This guide is about creating maintainable code and it touches on
+correctness and speed on occasion. For the former, formulate test suites;
+for the latter, start with stress test suites.

collects/scribblings/style/size.scrbl

@@ -0,0 +1,14 @@
+#lang scribble/base
+
+@(require "shared.rkt")
+
+@title{Size Matters}
+
+@; -----------------------------------------------------------------------------
+@section{Code Units}
+
+Keep functions small. Keep classes small. Keep units small. Keep modules small.
+
+Anytime a unit of code looks incomprehensible, it is probably too
+large. Break it up into smaller units. To bring across what these smaller
+units compute, implement or serve, use meaningful names.

collects/scribblings/style/style.scrbl

@@ -22,7 +22,16 @@ This document spells out these criteria, and it is also a call for
  meta-code, and the same ideas apply. If you have suggestions, contact the
  authors via email.
 
+@bold{Note} We understand that some of the files in the code base do not
+ live up to these standards. Help us improve these files. If you need to
+ edit and understand a file that fails in some ways, take the time to
+ reorganize it properly as soon as the comprehension step takes longer than
+ a few minutes. Because if understanding takes a lot of time, it is likely
+ that the file isn't maintainable. Whoever touches the file next will be
+ grateful.
+
 @; -----------------------------------------------------------------------------
 
 @include-section["correct-maintain-speed.scrbl"]
+@include-section["size.scrbl"]
 @include-section["textual.scrbl"]