1. there are 4 variables, 2 variable interactions may be important so they can't be aliased. What resolution design is required, and how many data runs are needed to specify the relationship? 2.6 variables, 2 variable interactions are important, but they can be aliased with each other at this phase. What resolution design is required, and how many data runs are needed to specify the relationship? 3.4 variables, all interactions may be important including 3 factor interactions. How many runs are needed to specify the relationship? 1. there are 4 variables, 2 variable interactions may be important so they can't be aliased. What resolution design is required, and how many data runs are needed to specify the relationship? 2.6 variables, 2 variable interactions are important, but they can be aliased with each other at this phase. What resolution design is required, and how many data runs are needed to specify the relationship? 3.4 variables, all interactions may be important including 3 factor interactions. How many runs are needed to specify the relationship