The present invention provides a system for identifying at least one critical point in a procedure, comprising: a. at least one imaging device configured to provide, for any given time t, at least one first image in a field of view of a surgical environment and, for at least one time t + ∆t, to provide at least one second image in said field of view； b. processor in communication with said at least one imaging device； and, c. communicable database configured to (i) store said at least one first parameter at said time t； and (i) store said at least one first parameter at said time t + ∆t； wherein, from comparison between said at least one first parameter at said time t and said at least one first parameter at said time t + ∆t, said at least one critical point is identifiable.
