Page 131 - DCAP304_DCAP515_SOFTWARE_PROJECT_MANAGEMENT

Unit 6: Effort Estimation

Notes
Table 6.1: Example of Project Types and Relevant Estimation Methods

Type of Project Estimation Methods Used Performance Factors Used for
Adjusting Estimates
Development  Size – KLOC/ FP/ Use Case Points  Productivity (person days
 Effort / schedule is derived from required to produce a screen of
Size given complexity)
 Activity Based Approach  Application domain familiarity
 Number of requirements used to  Familiarity with the technology
estimate calendar time for systems
requirements specification, design
and integration / system testing
phases
 Parametric Model Approach
 Size – KLOC/ FP/ Use Case Points
 Effort / schedule – using
COCOMO
 Effort / schedule / resources –
using Knowledge Plan
Development Simple Estimating Relationships  Productivity (person days
(GUI)  Size measure – no. of screens (of required to produce a screen of
complexity Low/ Medium/ Very given complexity)
High) used for estimating effort /  Application domain familiarity
schedule in Construction (Coding/  Familiarity with the technology
Unit testing) phase
 Function Point
 Activity Based Approach
 Number of requirements used to
estimate calendar time for systems
requirements specification, design
and integration / system testing
phases
 Effort / schedule / resources –
using Knowledge PLAN
Development Analogy  The two projects were compared
(Reverse  Size estimation in terms of total in terms of tool usage, knowledge
Engineering) LOC transfer from customer, etc. and
 Productivity (in LOC/day) from a productivity value was adjusted
previous reverse engineering accordingly.
project on similar platform and
LOB was used
 Effort / schedule / resources –
using Knowledge PLAN( Refer
Estimation Binder under
Information Sharing for more
details on Knowledge PLAN )
Development Simple Estimating Relationships
(Conversion)  Size (in LOC) from the existing
Source Code
 Effort estimation using the
obtained size and the Conversion
Language Table
 Effort / schedule / resources –
using KnowledgePLAN
Contd.....
Partial Life Cycle Simple Estimating Relationships for  Productivity values from earlier
(Coding and coding new programs work requests in the same project
Unit Testing)  Size estimation in terms of LOC and / or from other similar
and Regular  Use productivity (LOC/day) to get projects are used
maintenance effort estimate
 Derive schedule based on effort
estimate, customer’s schedules and
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