1 For example, the disorder sickle cell anaemia is caused by a mutation in the gene that instructs the building of a protein called haemoglobin. 2  This causes the red blood cells to become an abnormal, rigid, sickle shape. 3  However, in African populations, having this mutation also protects against malaria.
Optimistic time - generally the shortest time in which the activity can be completed. It is common practice to specify optimistic times to be three standard deviations from the mean so that there is approximately a 1% chance that the activity will be completed within the optimistic time.
Finish-to Start - A type of relationship in which a successor activity can begin only when its (FS) predecessor activity finishes. Float - The amount of time that the start or finish of an activity can be delayed without affecting the project finish date. Forward Pass - The calculation of the network's early dates. Free Float - The amount of time that an activity's early start can be delayed without delaying the early start of a successor activity. Lag - An offset or delay from an activity to its successor. Late Finish (LF) - The latest date when an activity can start without delaying the project's completion.