Bryan  Fischer Author of Evaluating Organization Development

Bryan Fischer

Advanced Dimensional Management LLC

Subject-matter expert and researcher in GD&T, Tolerance Analysis, Engineering Standards, and 3D Product Definition, 3D MBD and 3D MBE.


Bryan is an internationally recognized expert with over 25 years of industrial experience, having held positions as a GD&T Subject-Matter Expert, Tolerance Analyst, Dimensional Management Engineer, Project Engineer, Design Lead, Designer, Design Checker, Design Drafter, CAD Programmer, Trainer and Consultant in the areas of GD&T, Drawing Quality, Dimensional Management, Tolerance Analysis and 3D Model-Based Processes (3D MBD and 3D MBE).  He has experience working, training and consulting in many industries, both commercial and government, with companies ranging from very small to the largest multi-national corporations.  He has consulted with inspection and CAD software developers to help them improve their implementations of GD&T, 3D PMI, and model-based product definition practices.   He is a member of the American Society of Mechanical Engineers (ASME), the American Society for Quality, and SAE International.  He is proud to be an ASME Certified Senior Level GD&T Professional.  He was the founding President of the NW Chapter of the American Design Drafting Association (ADDA) from 1992-1993.

Bryan is a leading researcher in 3D GD&T, 3D PMI, and 3D Model-Based Product Definition (MBD) and 3D Model-Based Enterprise (MBE).  He is working to develop standards, develop and improve software, and improve business process to allow industry to effectively move from 2D drawings to optimized use of annotated 3D models.  Focus is on national and international implementation of 3D product development and deployment, for agencies, OEMs, suppliers, and throughout the supply chain.

Standards Management

Bryan has been active in the area of corporate, national, and international standards development and standards management throughout his career.  He is a member of many standards committees and organizations as follows:

Member: Drafting and CAD Standards Development Activities for Various Employers (1986–2001)

Member: Drawing Practices Group (DRPRG): Conversion of MIL-STD-100 to ASME Y14.100 (1993–1996)

Member: ASME Y14.5 Sub-committee Support Group: Dimensioning and Tolerancing (1999–present)

Member: ASME Y14.41 Sub-committee Support Group: Product Definition Data Practices (3D Data)

Member: ASME Y14.43 Sub-committee: Dimensioning and Tolerancing of Gages and Fixtures (2006–present)

Member: ASME Y14.45 Sub-committee: Measurement Data Reporting (2008–present)

Member: ASME Y14.100 Sub-committee: Engineering Drawing Practices (1993–present)

Member: AIA-ASD LOTAR International Team: Processes for STEP and 3D Digital Data Product Definition (2009-present)

Member: ASME Technical Advisory Groups for ISO TC 10 and ISO TC 213 Engineering Standards Development

Member: ISO TC184/SC4 Industrial Data: STEP ISO 10303 Product Data Representation and Exchange

Bryan is an Adjunct Professor at OIT.

Books and Publications:

Fischer, Bryan R., Understanding Engineering Drawings,  Advanced Dimensional Management Press, 2000-2006.  Manual and workbook for training industrial staff in reading engineering drawings.

Fischer, Bryan R., Journeyman’s Guide to Geometric Dimensioning and Tolerancing: GD&T for a New Millennium, Advanced Dimensional Management Press, 2002-2009.  Training and reference manual for GD&T.

Fischer, Bryan R., Mechanical Tolerance Stackup and Analysis, CRC Press, 2004, 2011.  Exhaustive technical reference and textbook for teaching Mechanical Tolerancing, Tolerance Stackups and Tolerance Analysis.

Fischer, Bryan R., Tolerance Stackups, Tolerance Analysis & Tolerancing: Fundamentals, Philosophy, Techniques and Application – Plus and Minus Edition, Advanced Dimensional Management Press, 2005.  Training and reference manual for Tolerancing, Tolerance Stackups and Tolerance Analysis using Plus and Minus Dimensioning and Tolerancing.

Fischer, Bryan R., Workbooks for Tolerance Stackup and Tolerance Analysis: GD&T and Plus and Minus Editions, Advanced Dimensional Management Press, 2005.  Workbooks to accompany Tolerance Analysis reference manuals.

Fischer, Bryan R., Geometric Dimensioning and Tolerancing Visual Glossaries, Advanced Dimensional Management Press, 2006-2009.  Visual Training Reference for GD&T.  Adjuncts to “Journeyman’s Guide to GD&T.”

Fischer, Bryan R., Drawing Requirements Manual: 11th Ed. IHS Global, (1216 pgs: J. Leiblich orig. auth.); Revised 10th Ed. and wrote a new section on 3D PMI, Digital Modeling, Annotation, and Using Digital Data as Design Deliverables, 2008.

Fischer, Bryan R., GD&T Update Guide: ASME Y14.5-2009 – Changes, Improvements, and Clarifications, Advanced Dimensional Management Press, 2009.  Training and reference manual detailing changes in the ASME Y14.5-2009 standard.  


    Associate of Science - Drafting Technology, Ohlone College, Fremont, CA
    Associate Degree in Arts and Science, Columbia Basin College, Pasco, WA
    Bachelor of Science in Mechanical Engineering Technology, Oregon Institute of Technology (OIT), Portland, OR

Areas of Research / Professional Expertise

    Geometric Dimensioning and Tolerancing - ASME and ISO
    Tolerance Analysis
    Dimensional Management and Variation Management
    3D Product Definition
    3D Model-Based Product Definition (3D MBD)
    3D Model-Based Enterprise (3D MBE)
    3D PMI
    CAD System and Data Interoperability
    Engineering Standards



Featured Title
 Featured Title - Mechanical Tolerance Stackup & Analysis 2e - 1st Edition book cover



Version 3.0 of Tolerance Stackup Software Toolset Available by October 15, 2012

By: Bryan Fischer

Tolerance Stackup Software Toolset v3.0


The Tolerance Stackup Software Toolset is a set of Microsoft Excel®-based Spreadsheet Tools customized for solving Mechanical Tolerance Analysis and Tolerance Stackup problems. We offer versions of the Tolerance Stackup Software Toolset for use with GD&T-based designs, and versions of the Tolerance Stackup Software Toolset for use with Plus and Minus Tolerancing. Each version of the Tolerance Stackup Software Toolset includes files that are optimized for Excel 2010/ 2007 and for Excel 2003.


The tools are based on the techniques in the books "Mechanical Tolerance Stackup and Analysis."  We have added new functionality and commands to improve the tolerance analysis process and improve the final results.


More information is available at our website.