This document contains presentation slides on signal flow graphs (SFG). SFG is a graphical representation method for linear systems. Key points covered include: - Definitions of SFG terminology like nodes, branches, forward paths and loops. - Properties of SFG like it only applying to linear time-invariant systems. - How to construct a SFG from system equations or a block diagram. - Mason's gain formula for determining overall transfer function from a SFG. - Converting between SFG and block diagrams. - How feedback affects overall gain and stability of a system.