Understanding the NEC4 ECC Option A Activity Schedule

Key Highlights of NEC4 Option A and the Activity Schedule

Lump-Sum Pricing: NEC4 Option A is fundamentally a priced lump sum contract where the total price is broken down into an activity schedule.
Payment on Completion: Interim payments are directly linked to the completion of activities listed and priced in the activity schedule.
Contractor's Risk: Under Option A, the contractor primarily bears the financial risk of completing activities for the agreed lump sums in the activity schedule.

The New Engineering Contract (NEC) suite of contracts is widely used in the construction industry to promote collaboration and effective project management. Among the various options available within the NEC4 Engineering and Construction Contract (ECC), Option A, the "Priced contract with activity schedule," is a common choice for projects where the client has a fixed budget and the scope of work is relatively well-defined. This option is essentially a lump sum contract where the total price is itemized into a detailed activity schedule.

The activity schedule is a cornerstone of NEC4 Option A, serving as the basis for both the contractor's pricing and the client's interim payments. It is a list of activities that the contractor expects to carry out to provide the works, with a lump-sum price allocated to each activity. Unlike contracts that rely on bills of quantities with rates and measurements, the activity schedule in Option A focuses on the completion of defined tasks for a fixed price.

NEC4 Engineering and Construction Contract handbook cover

The NEC4 Engineering and Construction Contract provides the framework for Option A.

The Role of the Activity Schedule in NEC4 Option A

In an NEC4 Option A contract, the activity schedule is not merely a list of tasks; it is a contractual document with significant implications for payment and risk allocation. The contractor submits the priced activity schedule as part of their tender, and once accepted, it forms the basis for interim payments throughout the project.

Structure and Content of the Activity Schedule

The activity schedule should break down the entire scope of work into discrete activities. Each activity is assigned a lump-sum price. It is crucial that the sum of the prices for all activities in the schedule equals the total tendered contract price. While there is no strict limit on the number of activities, the level of detail should be sufficient to allow for clear progress assessment and payment. However, the activity schedule should not contain rates or quantities for individual work items within an activity; it is a schedule of lump-sum prices for activities.

Linking the Activity Schedule and the Programme

A key aspect of NEC4 Option A is the relationship between the activity schedule and the contract programme. Clause 31.4 of the NEC4 ECC requires the activities in the activity schedule to relate to the operations shown on the programme. This correlation is essential for effective project management and payment administration. Although they don't have to show precisely the same activities, there should be a clear link. Many practitioners find it beneficial to "cost load" the programme in line with the activity schedule, making it easier to assess progress and process interim payments directly from the programme.

Interim Payments Based on Activity Completion

Interim payments to the contractor under Option A are made upon the completion of the activities listed in the activity schedule. This can be for individual completed activities or groups of completed activities, provided they are without defect. The advantage of this approach is that it simplifies the administration of interim payments compared to methods requiring detailed measurement of work done. The project manager assesses the completed activities, and payment is released accordingly.

The contractor is paid the lump sum price for an activity once it is completed. This reinforces the lump-sum nature of the contract and places the risk on the contractor to complete the activity within the allocated price.

Risk Allocation under NEC4 Option A

Under NEC4 Option A, the financial risk of carrying out the work at the agreed prices is largely borne by the contractor. The contractor prices each activity with the understanding that they will receive the lump sum price upon completion of that activity, regardless of the actual cost incurred. This incentivizes the contractor to manage their costs and execute the work efficiently to maximize their profit margin.

Implications for Compensation Events

Compensation events in NEC4 Option A are assessed differently than under cost-reimbursable options. When a compensation event occurs, it is assessed based on the effect it has on the Defined Cost of the work, the cost of equipment and People, and the resulting effect on the total Prices. If the scope of work is omitted due to a compensation event, the contractor is entitled to their Defined Cost plus Fee for the work performed up to that point, and the remaining portion of the activity's price is deducted from the total Prices. This differs from simply removing an activity from the schedule without a compensation event.

Key Features and Considerations for NEC4 Option A

NEC4 Option A is well-suited for relatively straightforward projects where the scope is clearly defined and the client seeks price certainty. It can accommodate any level of design responsibility. However, parties should be aware of certain considerations when using this option.

Pros of using Option A

Price Certainty for the Client: The lump-sum nature of the activity schedule provides the client with a high degree of price certainty from the outset of the project.
Simplified Payment Process: Interim payments are straightforward, based on the completion of defined activities rather than detailed measurement.
Contractor Incentive for Efficiency: The contractor is incentivized to complete activities within the agreed price, encouraging efficient working practices.

Cons and Challenges of using Option A

Risk to the Contractor: The contractor carries the risk of cost overruns within each activity price. Inaccurate pricing of activities can lead to financial losses for the contractor.
Less Flexibility for Scope Changes: Significant changes in scope can be more complex to manage under a lump-sum contract compared to cost-reimbursable options. Compensation events must be carefully assessed to determine their impact on the Prices.
Importance of an Accurate Activity Schedule: The accuracy and completeness of the activity schedule at the tender stage are critical. Errors in the schedule can lead to disputes later in the project.

Comparison with Other NEC4 Options

It's helpful to understand how Option A compares to other common NEC4 ECC main options to appreciate its specific application.

Option A vs. Option B (Priced contract with bill of quantities)

While both Option A and Option B are priced contracts, Option B utilizes a bill of quantities (BoQ) instead of an activity schedule. In Option B, interim payments are based on the measurement of completed work items according to the BoQ rates and quantities. This option transfers more measurement risk to the client compared to the lump-sum activity prices in Option A.

Option A vs. Option C (Target contract with activity schedule)

Option C is a target cost contract, meaning the contractor is reimbursed for their Defined Cost, and there is a mechanism for sharing cost savings or overruns against a target cost. While Option C also uses an activity schedule, its primary purpose is to establish the target price and forecast costs, rather than being the direct basis for interim payments as in Option A. The financial risk is shared between the client and the contractor in Option C.

The Activity Schedule in Practice

Creating a well-structured and comprehensive activity schedule is crucial for the successful implementation of an NEC4 Option A contract. The process typically involves breaking down the project into logical work packages and assigning a realistic lump sum price to each.

Developing the Activity Schedule

The contractor is typically responsible for preparing the activity schedule as part of their tender submission. This involves carefully considering the scope of work, the planned methodology, and the resources required for each activity. The prices allocated to each activity should reflect the contractor's estimate of the cost, including overheads and profit.

Agreement and Acceptance

The client's project manager reviews the contractor's proposed activity schedule and programme. The activity schedule, once accepted by the project manager, becomes a contractual document. It is important that the project manager ensures the activity schedule aligns with the scope and provides a reasonable basis for progress assessment and payment. The client cannot simply insist on changes to the activity schedule for their own benefit after acceptance; changes must be in accordance with the contract, typically through the compensation event process.

Managing Changes to the Activity Schedule

If there are changes to the scope of work or the planned sequence of activities, the activity schedule may need to be revised. Changes resulting from compensation events will lead to adjustments in the total Prices and potentially the activity schedule. The contractor can also propose changes to the activity schedule if it no longer reflects how they plan to do the works, but this revised schedule requires acceptance by the Project Manager.

Sample Activity Schedule Structure (Illustrative)

While the specific format can vary, a sample structure for a portion of an activity schedule might look like this:

Activity Number	Activity Description	Planned Start	Planned Finish	Price (£)
1.1	Site Establishment	Week 1	Week 2	15,000
1.2	Mobilization of Plant and Equipment	Week 1	Week 2	10,000
2.1	Excavation for Foundations	Week 3	Week 4	25,000
2.2	Casting of Concrete Foundations	Week 4	Week 5	30,000
3.1	Erection of Structural Steelwork	Week 6	Week 8	80,000

This table provides a simplified example. A real activity schedule for a construction project would be much more detailed, breaking down the work into many more granular activities.

Frequently Asked Questions about NEC4 Option A Activity Schedule

Can the client insist on changes to the activity schedule?

No, there is no provision in the NEC4 ECC that allows the client to insist on changes to the activity schedule for their own benefit once it has been accepted. Changes can occur through the compensation event process or if the contractor proposes a revised schedule that is accepted by the Project Manager.

What happens if an activity is partially completed?

Interim payments under Option A are made upon the completion of an activity. Payment is typically made for activities that are 100% complete and without defect. There is generally no provision for making partial payments for incomplete activities.

Should rates and quantities be included in the activity schedule?

No, the activity schedule should consist of a list of activities with a lump-sum price for each. It should not contain detailed rates and quantities for individual work items within an activity. If a contract requires payment based on measured quantities, Option B (Priced contract with bill of quantities) would be more appropriate.

How are compensation events handled in relation to the activity schedule?

Compensation events are assessed based on their effect on the Defined Cost and the resulting impact on the Prices (the total of the activity schedule prices). If a compensation event leads to the omission of work, the contractor is compensated for work done up to that point based on Defined Cost plus Fee, and a deduction is made from the Prices.

Is the activity schedule the same as the programme?

No, the activity schedule and the programme are distinct but related documents. The programme shows how the activities on the activity schedule are planned to be carried out over time. There should be a correlation between the two, and it is often beneficial to cost load the programme based on the activity schedule.