Allen White created the company Trust Consult in 1986, specialized in the design and implementation of financial and legal information systems for groups. As expert in consolidation combined with an IT background, he was also the creator of the software ECHO for statutory consolidation, which has become the leader of the Belgian market in 1995.

Since 1996, he has developed consultancy and training activities in the consolidation field through the company Conso Services.

To meet these objectives, a new tool has been developed , based on the latest technology and offering the highest level in quality standard and efficiency: SIGMA.

The market immediately reacted very positively to this announce and designated SIGMA right away as the natural successor of ECHO.

Sigma Software & Services was born in January 2002, to distribute, implement and guide the further development of the software SIGMA. Accordingly, it offers the complete range of consultancy services around its statutory consolidation products.

In January 2006, the new product Sigma InterWeb was launched to meet the increasing needs for efficient on-line intercompany matching to reduce the delays during the consolidation process.

Built with the latest technology, Sigma Interweb is a web-based solution that allows peer-to-peer reconciliation between all subsidiaries at the lowest information level.

In February 2009 Sigma Software & Services NV/SA changes its groupe identity into Sigma Conso NV/SA.

Conso Services is still active in consolidation training and consolidation products services.