narrower concept aim of research Concept analysis of variance Concept analytical model Concept basic research Concept boundary value problem Concept calculation model Concept case study Concept characteristic value Concept classification system Concept cluster analysis Concept correlation analysis Concept decision theory Concept design criterion Concept design method Concept evaluation criteria Concept factor of influence Concept finite difference method Concept forecasting method Concept input-output-analysis Concept iterative method Concept mathematical model Concept operational criterion Concept optimization Concept optimization method Concept optimization model Concept probabilistic Concept probability calculation Concept progress control Concept reduction method Concept regional science Concept regression analysis Concept research project Concept shift analysis Concept simulation Concept simulation method Concept simulation model Concept stiffness matrix method Concept system analysis Concept system comparison Concept system theory Concept test method Concept