Architecture Based Process

Establish business case for the system. e.g. Product cost, time to market.
Understand the requirements
- Use cases, prototypes
- Quality attributes
- Commonality & variability from previous/future systems - domain analysis.
Develop the architecture - use tactics, styles.
Document the architecture - using variety of views and ADL.
Analyse or evaluate the architecture.
Implement product based on the architecture.
Ensure that implementation conforms with architecture.

Process Recommendations

Architecture should be a product of a single architect or a small group of architects with a single leader.
Arch should have both functional reqs and an articulated, prioritized list of quality attributes.
Arch should be well documented with atleast one static view and one dynamic view.
Arch should be circulated to all stakeholders who should actively review.
Arch should be analysed for quantitative measures and formally evaluated for qualitative properties.
Should lend itself to incremental implementation via creation of a skeletal system.

The purpose of global analysis is to analyse the factors that influence the architecture and develop strategies for accommodating these factors in the architecture design.
Three types of factors:

1. Identify and describe factors
- Consider those that have significant global influence.
- Can factor be localized or is it truly global ?
2. Characterize the flexibility and changeability of the factors
- Can factor be changed, modified, influenced.
- How often will it change ? How likely ?
3. Analyse the impact of factors
- Other factors, component, design decisions.

1. Identify issues and influencing factors
- Identify handful of important issues that are influenced by factors and their changeability.
- Usually several factors affect an issue and when they conflict - we must negotiate a change in them.
- Difficult to satisfy factor, expensive factor.
2. Develop solutions and specific strategies
- Reduce or localize factor's influence.
3. Identify related strategies
- Dont repeat strategies identified with more than one issue. Reference them.