- The concurrent development model, is also called concurrent engineering, it allows a software team to represent iterative and concurrent elements of any of the process models
- For example, the modeling activity defined for the spiral model is accomplished by invoking one or more of the following software engineering actions: prototyping, analysis, and design
- The activity—modeling—may be in any one of the states noted at any given time
- Similarly, other activities, actions, or tasks can be represented in an analogous
- All software engineering activities exist concurrently but reside in different states
