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What is 90% Model Review and Its Key Objectives and Checkpoints in Engineering Projects

What is 90% Model Review?

In the realm of engineering projects, a 90% model review is a pivotal milestone in the design and development process. It refers to the stage where a project’s design is nearly 90% complete, and a comprehensive review is conducted to assess its viability, accuracy, and adherence to project requirements. This review is a crucial step to identify potential issues before moving forward to the final stages of construction or implementation.

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Objectives of 90% Model Review

The objectives of a 90% model review in engineering projects are multi-faceted and contribute to the overall success and quality of the project. Let’s delve into some of the primary objectives:

Ensuring Design Accuracy and Completeness

One of the core objectives of a 90% model review is to ensure that the design is accurate, complete, and aligns with the project’s specifications. This stage allows project teams to identify any discrepancies or missing components before proceeding further.

Minimizing Rework and Cost Overruns

By detecting issues and discrepancies at the 90% completion mark, the review aims to minimize the need for extensive rework during later stages. This directly translates to cost savings and prevents delays caused by unexpected changes.

Enhancing Safety and Compliance

Safety is a paramount concern in engineering projects. The 90% model review evaluates the design from a safety perspective, identifying potential hazards, and ensuring that safety standards and regulations are met.

Validating Feasibility and Constructability

Before progressing to the final stages of construction, it’s crucial to validate the feasibility and constructability of the design. The review assesses whether the design can be practically implemented without major hindrances.

Optimizing Performance and Functionality

The review process provides an opportunity to optimize the performance and functionality of the project. By identifying potential performance issues and suggesting improvements, the project’s overall effectiveness is enhanced.

90% Model Review Check Points

During a 90% model review, various aspects of the project are scrutinized to ensure its quality and viability. The review process involves evaluating several key checkpoints, including:


  • Hazard Identification: Identifying potential hazards in the design and proposing mitigating measures.
  • Emergency Response Planning: Ensuring that the design includes provisions for emergency response and evacuation procedures.


  • Site Layout: Reviewing the site layout to ensure efficient use of space and adherence to site requirements.
  • Grading and Drainage: Checking the grading and drainage plans to prevent water accumulation and erosion issues.


  • Structural Integrity: Verifying the structural integrity of buildings, foundations, and other structures.
  • Load Analysis: Ensuring that the design can withstand expected loads, including dead, live, wind, and seismic loads.


  • Equipment Layout: Reviewing the arrangement of equipment to ensure efficient operation and maintenance access.
  • Mechanical Systems: Evaluating HVAC, plumbing, and other mechanical systems for optimal performance and compliance.


  • Piping Layout: Reviewing the layout of pipes and pipelines to ensure proper routing and connections.
  • Fluid Dynamics: Checking for pressure drops, flow rates, and any potential issues related to fluid dynamics.

Electrical & Instrumentation

  • Electrical System Design: Evaluating the electrical system layout, including power distribution and lighting.
  • Instrumentation and Control: Reviewing instrumentation and control systems for accuracy and functionality.


Q1: What is a 90% model review in engineering projects? A1: A 90% model review is a critical stage where a project’s design is evaluated when it’s approximately 90% complete to identify potential issues and ensure accuracy.

Q2: Why is a 90% model review important? A2: The review helps identify discrepancies, enhance safety, validate feasibility, optimize performance, and minimize rework and cost overruns.

Q3: What are the key objectives of a 90% model review? A3: The objectives include ensuring design accuracy, minimizing rework, enhancing safety, validating feasibility, and optimizing performance.

Q4: What are the main checkpoints in a 90% model review? A4: The checkpoints cover safety, civil aspects, structural integrity, mechanical systems, piping layout, and electrical and instrumentation systems.

Q5: How does a 90% model review contribute to project success? A5: By addressing potential issues early, the review prevents costly delays, ensures compliance with regulations, and enhances the overall quality of the project.

In conclusion, a 90% model review plays a pivotal role in engineering projects, safeguarding accuracy, safety, and feasibility. By addressing design issues early and ensuring compliance with industry standards, this review stage significantly contributes to the successful execution of complex projects.

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90% Model Review: Video Details

Attempt Quiz

Question 1:

What is a “90% Model Review”?

Question 2:

What are the objectives of a 90% Model Review?

Question 3:

Which of the following is a typical 90% Model Review Check Point?

Question 4:

Which discipline is NOT typically covered in a 90% Model Review?

Question 5:

Which aspect of a project is often emphasized in a 90% Model Review?

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