Precedence Diagramming Method

Correct Answer: Cooking as predecessor to meal, drinks as parallel to the meal and dessert to start preparation mid-way into meal service

The answer 'Cooking as the predecessor to meal, drinks as parallel to the meal and dessert to start preparation mid-way into meal service' is the best fitting model because it accurately represents the dependencies outlined in the question. The meal cannot be served without cooking being completed first, hence 'cooking' is the predecessor to 'meal'. The drinks can be served simultaneously as the meal, which means they can be conducted in parallel. Dessert preparation can start when half of the meal is served, which means it is not entirely dependent on the completion of the meal. The answer 'Drinks as a predecessor to cooking and meal, dessert as a parallel task to meal' is wrong because it suggests that drinks should be served before cooking or meal, but the question states drinks can be served at the same time as the meal. The answer 'Cooking, meal, drinks, and dessert all as sequential tasks' is also wrong because it doesn't accommodate for the parallel serving of drinks and the staggered preparation of dessert. The answer 'Cooking and meal as sequential tasks, drinks and dessert as parallel tasks to meal' is incorrect because it suggests dessert preparation can start at the same time as the meal, but the question states dessert preparation should start when half of the meal is served.

Correct Answer: Add a milestone after implementation for customer sign-off and create a Finish-to-Start (FS) relationship between milestone and training

Task dependencies in a project can be categorized into four types: Finish-to-Start (FS), Start-to-Start (SS), Finish-to-Finish (FF), and Start-to-Finish (SF). In this scenario, the training cannot start until the customer signs off on the implementation. This signifies a Finish-to-Start (FS) relationship, as one task (customer sign off) must be completed before the next task (training) can begin. Therefore, in the precedence diagram, we need to model this dependency by adding a milestone after the implementation task for the customer sign-off and creating a Finish-to-Start (FS) relationship between this milestone and the training task. This would clearly represent that the training task is dependent on the completion of the sign off task by the customer. The other options are incorrect as they suggest different types of task relationships, Finish-to-Finish (FF), Start-to-Start (SS), or a direct Finish-to-Start (FS) relationship between implementation and training, none of which is suitable for this case scenario. Customer sign-off is a must after implementation which precedes any training.

Correct Answer: Plastering as a predecessor to painting, and door installation as parallel to painting

The interdependence of tasks in a Precedence Diagram is as follows: painting can only start after plastering has completed, signifying that plastering is a predecessor task to painting. Meanwhile, the door installation can be done alongside the painting, meaning it is a parallel activity to painting. This matches 'Plastering as a predecessor to painting, and door installation as parallel to painting'. The other options incorrectly suggest that plastering, painting, and door installation happen sequentially, or have door installation occurring simultaneously with plastering, or having plastering and door installation as parallel tasks with painting following both - these do not accurately mirror the relationship between the tasks as explained in the question.