Comparison-Model Hybrid
You can also use a combination of comparison estimation and mathematical models. Even a linear model of counting User Stories depends on the estimation of whether a User Story is “story size” by comparing with past experience and other stories. A linear model using Story Points nudges the comparison-model hybrid boundary in that it uses comparison-based sizes as input to a model calculation. Even the expensive commercial parametric models depending on Function Points can be adjusted by subjective factors.
Linear Projection of Affinity Estimates
I’ve used this approach when performing long-term estimation of requirements that are being detailed iteratively. It dovetails with the Multi-Level Decomposition approach of ...
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