--- a/unix-phil.ms	Sun Feb 21 17:23:19 2010 +0100
+++ b/unix-phil.ms	Sun Feb 21 17:33:23 2010 +0100
@@ -561,16 +561,19 @@
 is the one that survives.
 (This may be at the level of one creature, or at the level of one species.)
 The fitness of software is affected mainly by four properties:
-.IP \(bu
-portability of code
-.IP \(bu
-portability of data
-.IP \(bu
-range of usability
-.IP \(bu
-reuseability of parts
+portability of code, portability of data, range of usability, and reusability of parts.
+.\" .IP \(bu
+.\" portability of code
+.\" .IP \(bu
+.\" portability of data
+.\" .IP \(bu
+.\" range of usability
+.\" .IP \(bu
+.\" reuseability of parts
 .PP
-Portability of code means, using high-level programming languages,
+(1)
+.I "Portability of code
+means, using high-level programming languages,
 sticking to the standard,
 and avoiding optimizations that introduce dependencies on specific hardware.
 Hardware has a much lower lifetime than software.
@@ -580,7 +583,9 @@
 adaption is the key to success.
 .\" cf. practice of prog: ch08
 .PP
-Portability of data is best achieved by avoiding binary representations
+(2)
+.I "Portability of data
+is best achieved by avoiding binary representations
 to store data, because binary representations differ from machine to machine.
 Textual represenation is favored.
 Historically, ASCII was the charset of choice.
@@ -592,7 +597,10 @@
 to directly edit it with text editors and other tools from the Unix toolchest.
 .\" gancarz tenet 5
 .PP
-A large range of usability ensures good adaption, and thus good survival.
+(3)
+A large
+.I "range of usability
+ensures good adaption, and thus good survival.
 It is a special distinction if a software becomes used in fields of action,
 the original authors did never imagine.
 Software that solves problems in a general way will likely be used
@@ -615,7 +623,9 @@
 .LP
 Successful software adopts itself to the changing world.
 .PP
-Reuse of parts is even one step further.
+(4)
+.I "Reuse of parts
+is even one step further.
 A software may completely lose its field of action,
 but parts of which the software is build may be general and independent enough
 to survive this death.