Partners and Alliances

Testimonials from people that trust us


We are a proud Corporate Partner of the Business Continuity Institute.
We have direct business partnership framework agreements and have many times teamed with leading global prestigious companies as the ones that are indicatively referred below. Quality of collaboration and solid business partnerships to the benefit of our customers is of our key concern.


from people we worked with

“… SIGMA proved themselves to be an able subcontractor and a hard working team. They approache situations with a very creative and solution-oriented mind. Task assignments and projects are always completed on time and to our utmost satisfaction.

Having has superior communication skills. Consistently polite and friendly with strong interpersonal skills. Well liked and respected by our employees and our customers. Cooperative spirit, passion for high quality project delivery and flexible working style make them an outstanding subcontractor for our Business Consulting … “

Manager of Business Consulting
World-leading provider of Telecoms equipment & services

“… of great integrity, extremely dedicated to colleagues and work, and entirely professional, punctual and results driven. They shall be trusted to conduct business professionally and provide results in a timely manner, as well as to enjoy working with due to light humor and high spirit.

Furthermore, knowledge and extensive experience has allowed to be considered among the best in their field in Greece and the greater region. They are focused on delivering integrated solutions across the enterprise and corporate arena, offering specialized and project specific advice to support new business developments and assess existing organization structures…”

Senior Enterprise Architect
World-leading Provider of Information Technology

“… successfully managed the project, demonstrating a highly professional approach during the execution of consulting, deep and sound knowledge of field of expertise, result orientation and quality commitment.
They provided our firm with a personalized service, responding to our organization’s specific business environment, corporate policies, guidelines and operational requirements…”

IT & Business Support Director
World-Leading Tobacco Company

“… In all cases, SIGMA proved continuously precious, providing an outstanding Quality and Level of service, through their professionalism, results orientation, solid & structured approach and deep field knowledge.
We look forward in continuing to utilize them and their high edge Professional Consulting services in the forthcoming future. We also strongly recommend SIGMA services to any company, interested in their field of expertise.”

Business Services Director
World-Leading Pharmaceutical Company

“… high analytical thinking, broad experience of analytical equipment and computers software knowledge, and pioneer experience in Risk Management, have been totally instrumental to study and create an excellent system in QA Lab and Production dept., which is considered as a best practice example for worldwide manufacturing plants of our firm, and is a hang-up in intranet of corporate Quality Compliance Department. Mr Stamatis Tournis team is one of our best performer external collaborators.”

QA & New Products Introduction Manager
World leading Pharmaceutical & Consumer Cosmetics Products Industry

“… We were very pleased with the high standard of work delivered and professionalism throughout the whole project. They fast traced out and understood our wide-spread business environment requirements, considered all our UK HQs corporate guidelines and standards and successfully covered the project objectives…”

IT Manager
Leading Multinational Automotive Distributor

“… Dr Tournis was in charge of a team that delivered an Integrated Security Program for our company. This program was one of the biggest and most complex in our market, not only due to its size but also due to our specific business model, and was delivered without any deviations whatsoever, within schedule and according to its specifications.
During our collaboration, SIGMA team demonstrated their excellent professionalism and cooperation spirit, contributing effectively in the successful implementation of the program. They left us with the best impressions with regards to their know-how and character.
We would unconditionally recommend the use of SIGMA services to anyone interested in their services portfolio”.

General Director of Informatics and Corporate Research and Development
Leading European Lottery Organization

“… This was a piece of work within pressing timescales, because of the need for our company to present its work to its corporate management. The work undertaken was thorough & complete and was delivered as planned.

Very structured in approach, clearly explained the steps to be taken and the involvement required and delivered against this. The final outcome was thorough, met the objectives of the project and provided real value to us…”

IT Manager
Leading Pharmaceutical Company

“… I would like to express our profound contentment for your efforts and services provided during our Business Continuity Management Project… Your commitment, efforts and high quality of your services are greatly appreciated by everyone in our organization …”


Business Continuity Coordinator
Major Mobile Services Telecom Provider