1. Objective and scope

SCL Protocol (2022)

Provides general guidelines for analysing delays and disruptions in construction projects.
With an emphasis on Dispute resolution and proactive management of delays.
Encourage one prospective analysis (before the delay occurred).

AACE 29R-03 (2011)

Propose a methodology detailed and technical for forensic analysis of delays.
Focus on one Retrospective analysis, often used in claims and arbitration.
Describes different analytical methods based on scheduling data.

2. Approach to Delay Analysis

SCL Protocol

Prefer the method of Time Impact Analysis (TIA) in real time.
Recommend assessing delay events as they occur.
With an emphasis on Transparency and stakeholder communication.

AACE 29R-03

Propose several methods for analysing delays (Additive, Subtractive, Observational, etc.).
Define 9 methodologies subject to data availability and quality.
Come closer Technical and rigorous, classifying the methods according to their level of accuracy and objectivity.

3. Handling of concurrent delays

SCL Protocol

Recognises that several delays can occur simultaneously.
recommend a review based on the critical path and contractual provisions.

AACE 29R-03

Use detailed analytical approaches to handle concurrent delays.
Insists on the importance of historical data and critical path analysis.

4. Claims and dispute resolution

SCL Protocol

Oriented towards Dispute resolution.
Regularly document the impacts of delays.
Highlights contractual principles for dispute resolution.

AACE 29R-03

Plus In-depth and technical for forensic analysis of delays.
Commonly used in litigation, claims and arbitrations.
Provides standardised methods for demonstrate the impact of a delay.

5. Application in project management (Primavera P6, MS Project, etc.)

SCL Protocol

Encourages frequent schedule updates.
Compatible with Primavera P6 and other tools for real-time analysis.

AACE 29R-03

Compatible with Primavera P6 but requires advanced analytical methods.
Primarily used for analysis post-project in a context of claims.

Conclusion: which one to use?

✔ For proactive delay management and dispute prevention: SCL Protocol

✔ For in-depth forensic analysis (claims, arbitration, litigation): AACE 29R-03

👉 The two are complementary :

• SCL Operational approach to avoid disputes
• AACE 29R-03 Expert approach to analysing and defending a claim