How identifying the problems can be solved by using Six-sigma or JDI or lean?

Identifying the problems can be simplified by studying the entire value chain. The processes involved in the entire value chain have to be classified into tacts with respective tact times. The activities involved in each tact can be classified as VA (Value added) & NVA (Non Value Added) activities. Since the NVA's cannot be avoided, they can be reduced by various simplified techniques to improve the process efficiency, thus streamlining the entire process.