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- The Estimate Activity Resources process is concerned with coming up with the type, quantity and characteristics of resources needed to complete the specific activity. Resources might be human, material or equipment.
- Estimate Resources process is closely coordinated with Estimate Costs Process.


- Schedule Management Plan: This has the basic process of how-to come up with the activity resources. It might specify importance of certain skills over others.
- Activity List: This has the list of project activities to be resourced.
- Activity Attributes: A detailed description for each of the activities and any other details needing attention for further processing.
- Enterprise Environmental Factors: The constraints under which the organization is performing. Any vacations needing to be accounted.
- Organizational Process Assets: Lessons learnt from previous similar projects, if any.
- Resource Calendars: What is the availability schedule for the concerned resource.
- Risk Register: This has the list of risks identified in the project. The resource estimation will need to account and cover the risk factors.
- Activity Cost Estimates: While it is important to select the correct resource for the activity, the cost estimate also needs to be referenced during the selection of the resource.

Tools & Techniques

- Expert Judgment: While deciding on options there might be need for opinion from senior management or leveraging prior experience.
- Alternative Analysis: Make or buy decision. If cost of procuring is high, maybe use existing capability with some consultant support.
- Published Estimating Data: Rather than do estimation from scratch, use existing data available as benchmark.
- Bottom-Up Estimating: This is the most accurate way of estimating when resource details cannot be estimated at the work package level. - Project Management Software: The most important tool to document resource estimates for each activity. Ability to group resources and assign capability and costs for accounting other aspects of project management.


- Activity Resource Requirements: What quantity and type of resources are needed for each activity in the activity list.
- Resource Breakdown Structure: A hierarchical representation of resources by types or any other way like phase-wise allocation to give better insight to project stakeholders.
- Project Document Updates: Since project scheduling is considered as an iterative approach, certain updates to activity list or attributes might happen for further use during creation of final schedule or estimating activity durations.

Match the Following

1. Published Estimating Data - a. Resource Hierarchy
2. Resource Calendar - b. Resource Availability
3. Activity list - c. Accurate Estimation
4. Bottom-Up Estimating - d. Estimate Activity Resources Input
5. Resource Breakdown Structure– e. List of risks
6. Risk Register– f. Market Data

Match the Following (Answers)

1. Published Estimating Data - f. Market Data
2. Resource Calendar - b. Resource Availability
3. Activity list - d. Estimate Activity Resources Input
4. Bottom-Up Estimating - c. Accurate Estimation
5. Resource Breakdown Structure– a. Resource Hierarchy
6. Risk Register – e. List of risks