Task-based estimating is often
described as "bottom-up" estimating.
The estimate is built up by identifying all the various
tasks involved in completing the project. For each task,
the estimator identifies the probable time and costs.
The total time and costs for the project is simply the
addition of the time and costs for each task.
The key features are:
identify each stage and task in the
project
estimate each stage or task separately
use past experience or knowledge
-
refer to all
available historic information for past projects
-
refer to any
available information from external sources
adjust the estimates in the light of the
available staff skills and experience
adjust the estimates in the light of known
factors that will impact on the project
compile the total time and costs
remove individual contingencies and create
a single, overall contingency
