SPEM — Precedes dependencies (p. 6-3)

Although the precedes dependency may be enough for the family of software
development proc-esses whose modelling is the main interest of SPEM, it
should be noted that finish-start and finish-finish precedence relationships
are clearly insufficient when detailed software processes are to be
modelled.
Proposed resolution: Incorporate other precedence relationships to the SPEM
definition. See, for instance:

Schlenoff, C., Gruninger M., Tissot, F., Valois, J., Lubell, J., Lee, J.,
The Process Specification Language (PSL): Overview and Version 1.0
Specification, NISTIR 6459, National Institute of Standards and Technology,
Gaithersburg, MD (2000).

Ribó J.M; Franch X.: Building Expressive and Flexible Process Models using
an UML-based approach. LNCS, Vol. 2077. Springer-Verlag (2001).

Accept.