Language Visualisation: Applications and Theoretical Foundations of a Primitive-Based Approach. - Ajit Narayanan; Darrel Manuel; Lindsey Ford; Daniel James Tallis; Masoud Yazdani (Artif. Intell. Rev., 1995)

CREWS Validation Frames: Patterns for Validating Systems Requirements. - Neil A. M. Maiden; M. Cisse; H. Perez; Darrel Manuel (REFSQ, 1998)

Supporting Scenario-Based Requirements Engineering. - Alistair G. Sutcliffe; Neil A. M. Maiden; Shailey Minocha; Darrel Manuel (IEEE Trans. Software Eng., 1998)

A co-operative scenario based approach to acquisition and validation of system requirements: How exceptions can help! - Neil A. M. Maiden; Shailey Minocha; Alistair G. Sutcliffe; Darrel Manuel; Michele Ryan (Interact. Comput., 1999)