00sr008

REPORT DOCUMENTATION PAGE
Form Approved
OMB No. 0704-0188
Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching
existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this
burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services,
Directorate for information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management
and Budget, Paperwork Reduction Project (0704-0188), Washington, DC 20503.
3. REPORT TYPE AND DATES COVERED
1. AGENCY USE ONLY
(LEAVE BLANK)
2. REPORT DATE
July 2000
Final
4. TITLE AND SUBTITLE
Spiral Development: Experience, Principles and Refinements
6. AUTHOR(S)
Barry Boehm, Wilfred J Hansen, editor
7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)
Software Engineering Institute
Carnegie Mellon University
Pittsburgh, PA 15213
9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)
HQ ESC/XPK
5 Eglin Street
Hanscom AFB, MA 01731-2116
11. SUPPLEMENTARY NOTES
5. FUNDING NUMBERS
C — F19628-95-C-0003
8. PERFORMING ORGANIZATION
REPORT NUMBER
CMU/SEI-2000-SR-008
10. SPONSORING/MONITORING
AGENCY REPORT NUMBER
12.A DISTRIBUTION/AVAILABILITY STATEMENT
12.B DISTRIBUTION CODE
Unclassified/Unlimited, DTIC, NTIS
13. abstract (maximum 200 words)
Spiral development is a family of software development processes characterized by repeatedly
iterating a set of elemental development processes and managing risk so it is
actively being reduced. This paper characterizes spiral development by enumerating a
few “invariant” properties that any such process must exhibit. For each, a set of “variants”
is also presented, demonstrating a range of process definitions in the spiral development
family. Each invariant excludes one or more “hazardous spiral look-alike” models, which
are also outlined. This report also shows how the spiral model can be used for a more
cost-effective incremental commitment of funds, via an analogy of the spiral model to stud
poker. An important and relatively recent innovation to the spiral model has been the introduction
of anchor point milestones. The latter part of the paper describes and discusses
these.
14. SUBJECT TERMS Spiral development model, invariant,
variant, anchor point milestones, software development,
project management, risk management, cyclic
phases, iterative process
INTS
16. PRICE CODE
17. SECURITY CLASSIFICATION
OF REPORT
UNCLASSIFIED
18. SECURITY
CLASSIFICATION OF
THIS PAGE
UNCLASSIFIED
15. NUMBER OF PAGES
36
19. SECURITY
CLASSIFICATION
OF ABSTRACT
UNCLASSIFIED
NSN 7540-01-280-5500 Standard Form 298 (Rev. 2-89)
Prescribed by ANSI Std. Z39-18
298-102
20. LIMITATION OF ABSTRACT
UL
CMU/SEI-2000-SR-008 37