1. Introduction (First Response). 
    First Things First. 
    Reasons for Inheritance. 
    What Next? 
    Observe the Program in Its Natural Habitat. 
    Get Personal. 
    Strictness. 
    Warnings. 
2. Surveying the Scene. 
    Versions. 
    Part or Whole? 
    Find the Dependencies. 
3. Test Now, Test Forever (Diagnosis). 
    Testing Your Patience. 
    Extreme Testing. 
    An Example Using Test- Modules. 
    Testing Legacy Code. 
    A Final Encouragement. 
4. Rewriting (Transplants). 
    Strategizing. 
    Why Are You Doing This? 
    Style. Comments. Restyling. 
    Variable Renaming. 
    Editing. 
    Line Editing. 
    Antipatterns. 
    Evolution. 
5. The Disciplined Perl Program.
    Package Variables vs Lexical Variables.
    Warnings and Strictness.
    use strict in Detail.
    use warnings in Detail.
    Selective Disabling.
    Caveat Programmer.
    Perl Poetry.
6. Restructuring (The Operating Table). 
    Keep It Brief. 
    Cargo Cult Perl. 
    Escaping the Global Variable Trap. 
    Debugging Strategies. 
7. Upgrading (Plastic Surgery). 
    Strategies. 
    Perl 4. Perl 5.000. Perl 5.001. Perl 5.002. Perl 5.003. Perl 5.004.
    Perl 5.005. Perl 5.6.0. Perl 5.6.1. Perl 5.8.0. Perl 5.8.1. 
    Perl 5.8.2. Perl 5.8.3. 
8. Using Modules (Genetic Enhancement). 
    The Case for CPAN. 
    Using CPAN. 
    Improving Code with Modules. 
    Custom Perls. 
9. Analysis (Forensic Pathology). 
    Static Analysis. 
    Eliminating Superfluous Code. 
    Finding Inefficient Code. 
    Debugging. 
10. Increasing Maintainability (Prophylaxis)
    Making It Robust.
    Advanced Brevity.
    Documentation.
    Custom Warnings.
    Version Control System Integration.
11. A Case Study. 
    The Setup. 
    Triage. 
    Desperately Seeking Sanity. 
    Coming into the 21st Century. 
    Incorporating Modules Effectively, 
12. Conclusion (Prognosis).