In DMAIC methodology, a data collection plan is created during the Measure phase. It is a tool that focuses your data collection efforts.
You will encounter many different data types in Six Sigma. The type of data you have will dictate what you can do and the tools you can use.
The process mapping is a tool that graphically shows the inputs, actions & outputs of a process in a clear, step-by-step map of the process.
A SIPOC (Supplier, Input, Process, Output, and Customer) is a high-level process mapping tool to help visualize a process and its influences.
An affinity diagram helps organize ideas into meaningful categories. This makes analysis on large data sets easier.