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Useful Metrics

It is difficult to know what to measure before you know what is important.
This often
results in one of the following:
- Measure nothing
. This means you cannot claim success by any but the grossest measures,
i. e. "did
you improve upon normal schedule and budget," which we've already
stated will be
a long shot on a first
Smalltalk project.
- Measure everything
. The resulting sea of data might be as useful to adversaries as it is to
you! For
example, "lines of code per person month" will look dismal if a
lot of re-use is
realized or if your team is inexperienced, and "defect count"
may look abnormally
high if your process stresses continuous testing.
Here are some metrics we feel are more useful than traditional ones:
- Locality of reference
: how often is "self" and "super" used? (How little
are globals, class names, and
class variables used? Coupling vs. cohesion analysis.)
- Degree/use of abstraction
: How deep is the hierarchy? How little are concrete class names used?
- Code thrash
: what is the average number of changes per method?
- Interface size
: how "thick" is a module's external interface? (How many
methods are public, both
by design and de-facto?) How "deep" is a module's interface?
(How much of the implementation
exposed -- does it require any Collection
as an argument, or must it be an instance of
MySpecificCollectionThatDoesOneThingOnly
?)
- Function count
: how many distinct functions does a module perform? ("A module having more than one design decision is
'poorer'" [Bilow
93])
- Specification quality
: What is the commentary/code ratio? Are methods/classes/modules usable
without looking
at (and figuring out) their code?
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