STAR Application & Interpretation
Guidance on software reliability modeling, defect prediction, quality assessment, release readiness, and interpreting predictive results.
ENGINEERING CONSULTING · TECHNICAL ADVISORY
Consulting Services
Expert Engineering Consulting & Technical Advisory
Leverage decades of experience in software reliability, system performance engineering, and software quality to address complex engineering challenges.
Whether applying 3S technologies or seeking independent technical expertise, 3S provides specialized guidance tailored to your organization's needs.
Two ways to work with 3S
Our Consulting Services
3S offers two complementary consulting approaches to help organizations address their engineering and technology challenges.
01 · 3S TECHNOLOGY CONSULTING
Applying 3S Technologies to Engineering Challenges
Technical guidance and consulting to help organizations understand, apply, and maximize the value of 3S technologies within their engineering environments.
Areas of Support01 — 04
FUSION Application & Analysis
Guidance on integrated software–hardware reliability, system performance, availability, and operational analysis.
Engineering Process Integration
Recommendations for incorporating predictive analytics, reliability modeling, and quality engineering into existing workflows.
Technical Implementation Guidance
Support in applying STAR and FUSION to organizational objectives, engineering processes, and specific technical challenges.
Connect with our experts to discuss your technology-related engineering needs.
Request 3S Technology Consulting02 · INDEPENDENT TECHNICAL CONSULTING
Specialized Engineering Knowledge & Advisory
Independent consulting services drawing on decades of experience in software reliability, system performance engineering, software quality, and complex systems.
These services are available independently of 3S software products and can be tailored to an organization's specific engineering needs.
Areas of Expertise01 — 04
Software Reliability & Quality
Reliability modeling, software quality assessment, defect analysis, release readiness, and corrective-action guidance.
Integrated System Reliability
System reliability, availability analysis, performance bottlenecks, failure and recovery analysis, and operational risk assessment.
Engineering Tools & Digital Engineering
Evaluation and development strategies for software quality and reliability engineering tools, analytical models, and predictive technologies.
Technical Advisory & Independent Review
Expert reviews of complex software-intensive systems, technical approaches, reliability programs, and critical engineering decisions.
Work directly with Dr. Okumoto to address complex technical challenges, evaluate engineering approaches, and gain expert insight based on decades of industry experience.
Request Independent Technical ConsultingRESEARCH BACKED. FIELD TESTED.
Meet Our Expert
Technical leadership · 3SFounder & CEO | Senior Technical Consultant
Dr. Kazuhira (Kazu) Okumoto, Ph.D.
Sakura Software Solutions (3S), LLC
Dr. Okumoto brings more than 40 years of industrial experience in software reliability, system performance engineering, software quality, and technical leadership.
During his career at Bell Labs, he co-developed the widely recognized Goel–Okumoto software reliability model and received Distinguished Member of Technical Staff (DMTS) recognition.
As Founder and CEO of Sakura Software Solutions, he leads the development of advanced engineering technologies, including STAR for software quality prediction, FUSION for integrated software–hardware reliability, and iGRED for visual reliability modeling.
His experience spans reliability research, large-scale software and systems engineering, engineering-tool development, and customer-facing technical leadership.
40+Years of industrial experience
Ph.D.Syracuse University, 1979
Selected Career Highlights
- 01Co-developer of the Goel–Okumoto software reliability model.
- 02Bell Labs Distinguished Member of Technical Staff (DMTS).
- 03Led a Japan customer-facing technical support organization of more than 65 staff.
- 04Developed BRACE, an online software quality assessment tool and predecessor to STAR.
- 05Principal Investigator on NSF STTR Phase I research focused on integrated software–hardware reliability.
- 06Co-author of Software Reliability: Measurement, Prediction, Application.
Areas of Expertise
- Software reliability modeling
- Defect prediction
- Software quality
- Queueing and capacity modeling
- System performance
- Availability engineering
- Failure and recovery analysis
- Technical R&D strategy
Selected Publications
View More Publications- Goel, A. L., & Okumoto, K. (1979). Time-dependent error-detection rate model for software reliability and other performance measures. IEEE Transactions on Reliability.
- Musa, J. D., Iannino, A., & Okumoto, K. (1987). Software Reliability: Measurement, Prediction, Application. McGraw-Hill.
- Okumoto, K. (2024). STAR: An Innovative Data-Driven Solution for Software Quality Assurance. Springer.
- Okumoto, K., & Pham, H. (2025). Digital Transformation in Software Quality Assurance. Springer.
Request a Consultation
Tell us about your engineering challenge and the expertise you need.