SLIM-Estimate's macro estimation approach uses product size and productivity to estimate project time and effort tradeoffs.  Selecting the best sizing technique and units of measure can be challenging.  The following resources help you understand basic concepts and how to use the in SLIM-Estimate .

• SLIM-Estimate Sizing Techniques Quick Reference
• Constructing Sizing Methods
• A Method for Improving Developers’ Size Estimates 
• Gearing Factors: A Flexible Sizing Technique