Representation of assembly sequence is significantly essential to describe many assembly attributes such as the connections between the components, sequence of the assembly operations, assembly trajectory constraints, assembly mating conditions, etc. Graphical or tree structure-based assembly sequence representation methods are most used in assembly sequence planning to obtain feasible assembly sequence, and to represent assembly attributes. Assembly sequence representation methodology carries an important role in assembly sequence planning and automation. There exist many methodologies of assembly sequence representation; each has its own functional goals besides the limitations. Various methods of assembly sequence representations, their applications and limitations are articulated. The advancement of graphical representation methods to automate the assembly sequence generation from past three decades and their influence is briefly illustrated in this paper.Keywords: Assembly sequence representation, liaison graph, connectivity graph
