PRETTI Table Task Glossary
These are used in each Task represented in a PRETTI P4
- c : cost
- cn : cost at node
- cw : cost at waypoint
- d : dependents
- e : eco2
- en : eco2 at node
- ew : eco2 at waypoint
- fw : float at waypoint (tn - tw)
- node : A task in a network. Summaries include all its direct and indirect dependents
- t : (crash) duration
- tn : (crash) duration at node
- tw : (crash) duration at waypoint.
- waypoint : A task along one path
Q1: What is PRETTI?
A1: PRETTI is acronym for Project Reporting Evaluation and Track Task Interpretation. PRETTI is a network analysis presented as a table with each column representing a path. Each cell represents a task on a path. PRETTI supercedes PANERLFPFT: Project Activity Network Evaluation by Reporting Low Float Paths in Fast Tracks
Q2: What is a node?
A2: A node in a network represents a task. A task may have multiple dependencies. When interpreting 'node' in the context of PRETTI, node refers to the sum of the values for the task and all it's dependents.
Q3: What is a waypoint?
A3: A waypoint is a point along a single path. When interpreting 'waypoint' in the context of PRETTI, waypoint refers to the sum of the values for the task and previous tasks on the same path.
Q4: How can I tell the difference between a node and a path?
A4: A node considers all dependencies of a task, whereas a path considers only one branch of dependents of a task. For example, consider a network ABC consisting of a task C with dependent tasks A and B. Node calculations for C would include A and B. The network ABC would consist of two paths AC and BC. Path AC ( A to C ) would only sum values for A to C ( A and C since there are only two tasks ). Path BC ( B to C ) would only sum values for B to C ( the same as the sum of the values of task B and C, since there are only two tasks ).