The **lowest level of the Work Breakdown Structure (WBS)** is called a **work package**.
### Explanation:
1. **Work Breakdown Structure (WBS)** is a hierarchical decomposition of a project into smaller components. The purpose of WBS is to break down a project into manageable sections to improve project management and clarity.
2. **Work Package** is the smallest and most detailed level of the WBS. It represents tasks that:
- Can be assigned to a team or individual for completion.
- Are manageable in terms of cost and time.
- Can be monitored and controlled in terms of progress.
### Example:
In **house construction**, the WBS may start from the overall project ("Build a House"), break down into major phases (e.g., **foundation**, **framing**, **roofing**), and further split into individual tasks. The lowest level could be a work package like “Pour Concrete for Foundation,” which is specific, measurable, and manageable.
Here's a summary of **Work Breakdown Structure (WBS)** levels using a house construction project as an example. Each level breaks down the project into smaller, more manageable tasks:
### **Level 1: Project**
- **Example**: Build a House
- This is the overall goal or deliverable of the project. At this level, the project is still a high-level concept.
### **Level 2: Major Deliverables/Phases**
- **Example**:
- **Foundation Work**
- **Framing**
- **Roofing**
- **Plumbing**
- **Electrical Work**
- This level breaks the project into **major components** or **phases**, such as the foundation, structure, and finishing stages.
### **Level 3: Sub-deliverables**
- **Example for Foundation Work**:
- **Excavation**
- **Pour Footings**
- **Install Rebar**
- **Pour Concrete Slab**
- Here, each major deliverable (like foundation) is broken down into **sub-deliverables**, which are more detailed tasks or groupings of activities.
### **Level 4: Activities/Tasks**
- **Example for Pour Concrete Slab**:
- **Prepare the Site**
- **Mix Concrete**
- **Pour Concrete**
- **Level and Finish Concrete**
- At this level, each sub-deliverable is broken down into **individual tasks** or **activities** that can be executed and tracked.
### **Level 5: Work Package (Lowest Level)**
- **Example for Pour Concrete**:
- **Order Concrete (5m³)**
- **Ensure Concrete Truck Access**
- **Supervise Pouring (2 hours)**
- The **work package** is the smallest unit in the WBS. It is specific, with assigned resources, timelines, and costs. This is where actual **work is performed**.
### Summary of Levels:
1. **Project**: Build a House.
2. **Major Deliverables**: Foundation, Framing, Roofing.
3. **Sub-deliverables**: Foundation has tasks like excavation, pouring footings.
4. **Activities**: Pouring footings has steps like preparing the site and pouring concrete.
5. **Work Package**: The smallest task, e.g., ordering concrete and managing truck access.
In this way, the WBS breaks down a project into manageable pieces, from the overall project (Level 1) to specific, actionable tasks (Level 5).
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