Abstract: A computer-implemented process for defining a telecommunications product in accordance with a predefined schema, the process including the steps of: receiving, via a user interface, a request from a user for a specification for the telecommunications product; receiving, via the user interface, characteristics data representing one or more characteristics for the specification from the user, including a plurality of properties for at least one of the characteristics; receiving, via the user interface, input rules data representing at least one rule for the specification, including: a selection of at least one of the received characteristics to provide a condition characteristic for the rule to operate, a selection of a rule type to define operation of the rule, and a selection of at least one of the received characteristics to provide a target characteristic on which the rule will operate; and processing the characteristics data and the input rules data, according to the predefined schema, to generate specific