tema 4 Flashcards
What does Schedule stand for?
Is a timeline that outlines when specific tasks or activities will start and finish. It serves as a plan for organizing, sequencing, and allocating resources to ensure project deliverables are completed on time.
activities/tasks , durations, dependencies, milestones, resources
To Create the Schedule, From Where Do We Start?
1.Defenir WBS
2.Identificar atividades
3. Estimar durações
4. Defenir dependencias
5. alocar recursos
6.sequenciar atividades
7.desenvolver o schedule
8.baseline o schedule
Differences Between Milestone Diagram and Gantt Diagram
Milestone Diagram: Highlights key events or achievements in the project. Focus on Milestones (no detailed tasks or durations).
Gantt:Shows the timeline, tasks, durations, and dependencies. Focus on Tasks, durations, and dependencies in detail.
And between a Gantt and a Precedence Diagram?
Precedence Diagram: Represents tasks and their dependencies in a flowchart-like structure.
What kind of precedence relationship do you know?
Finish-to-Start (FS):
Task B cannot start until Task A finishes.
Start-to-Start (SS):
Task B cannot start until Task A has started.
Finish-to-Finish (FF):
Task B cannot finish until Task A has finished.
Start-to-Finish (SF):
Task B cannot finish until Task A has started (least common).
when should you use gantt or precedence diagram?
Use a Gantt Chart when you need to track progress and communicate the timeline to stakeholders.
Use a Precedence Diagram when planning dependencies, optimizing the critical path, or ensuring logical task sequencing.
What Are the Lag Times Between Tasks? (tiempo de desfase)
Lag time is the delay intentionally introduced between two dependent tasks. It represents a period where no activity occurs before the successor task can start.
Is There Any Relationship Between Work Package Duration and Its Resources?
Inverse Relationship: Increasing resources can reduce the duration of the work package
If we accept probabilistic distribution β for task duration, how to estimate the averaged duration?
E(T)=(otimista +4*maior probabilidade + pessimista) /6
How much the variance would be?
v= ((Pessimista-otimista)/6)^2
What are the main hypotheses for the P.E.R.T method?
(Program Evaluation and Review Technique) method are:
-Task durations follow a beta distribution
-Dependencies are fixed: Tasks follow a defined sequence with clear predecessor-successor relationships.
-Critical path determines project duration: The longest path through the network determines the project completion time.
-Estimates are probabilistic: Task durations include three estimates (optimistic, most likely, pessimistic) to account for uncertainty.
What are the differences with the Critical Path Method (CPM)?
P.E.R.T: Based on beta distribution and expected durations.
Probabilistic (optimistic, most likely, pessimistic). Used for projects with high uncertainty.
CPM (Critical Path Method):
Based on fixed, known durations for tasks.
Deterministic (single-point estimates). Used for projects with well-defined, predictable tasks.
What is the unit for monitoring and controlling the schedule in Gantt?
the unit in a Gantt chart is time
What is the major issue with the Gantt approach?
-does not visually emphasize task dependencies, making it harder to identify critical paths or bottlenecks.
Lack of Real-Time Adaptation:
They are static representations and require frequent manual updates.
Resource Constraints:
Gantt does not inherently account for resource availability or allocation issues
What is the unit for monitoring and controlling the schedule in CPM?
The unit in CPM (Critical Path Method) is float (or slack) time, which measures the flexibility of non-critical tasks without impacting the project completion.
