General

	Purpose: To collect into one place several views of Project Life Cycle.
	Scope: Section above is a collection of Life Cycle related diagrams, which could be used as a reference tool.
	Status: Draft release.

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Glossary and Abbreviations

Project Life Cycle

Life Cycle:: Simplified Diagram

A Simplified Life Cycle Diagram is shown on the Figure 1.

Fig.1: Life Cycle:: Simplified Diagram

There are 4 main Phases in Life Cycle:

• Analysis,
• Design,
  
• Construction, and
  
• Implementation.
  

• We need to understand that every product (and the Software as well) have phases and steps which it passes during its development and Life Cycle. Each step takes time, and for example, if Business users will change their requirements at the Product Delivery stage, this may fail the whole project, because we may need to change the Software Package (and therefore redo the whole project from scratch). This may cause infinitive time of the product implementation.
• Another idea is that is we developing new product to replace previous one we need to start work on a Data Conversion (as a separate sub-task) at the requirements definition step to make sure our requirements will fully describe compatibility issues.

Life Cycle:: Simplified V-Model:: Engineering Activities

A Simplified V-Model of the Life Cycle is shown on the Figure 2.

Fig.2: Life Cycle:: Simplified V-Model:: Engineering Activities

Such representation is used to show responsibilities of three different areas of the Engineering Activities:

1. System Engineering
2. Software System Engineering
3. Software System Engineering

Life Cycle:: Processes:: Structure (ISO/IEC 12207)

Description of the Life Cycle Processes is given in ISO/IEC 12207 (Software Lifecycle Process). Processes Structure of the Life Cycle is shown on the Figure 3.

Fig.3: Life Cycle:: Processes:: Structure

Processes are grouped into three Groups: 

1. Main Processes,
2. Support Processes, and
   
3. Organizational Processes.

Life Cycle:: Processes, Roles, Views (ISO/IEC Standard 12207)

Description of the Life Cycle Processes is given in ISO/IEC 12207 (Software Lifecycle Process). See Figure 4 for Life Cycle Processes, Roles, Views Diagram.

Fig.4: Life Cycle:: Processes, Roles, Views

Figure 4 shows not only list and groups of the Processes, but also relations between them and views of the Processes from different standing points (e.g. Developer, Purchaser, Supplier, User etc.).

On the diagram Figure 4 Employment Relationships between Processes are shown as well.

Life Cycle:: Processes Classification (ISO/IEC 12207)

Software Life Cycle Processes Classification is described in the ISO/IEC 12207 (Software Lifecycle Process). Simplified Classification is shown on the Figure 5.

Fig.5: Life Cycle:: Processes Classification

Life Cycle:: Prototypes, Activities, and Outputs Matrix

Detailed Life Cycle is shown on the Figure 6.

Fig.6: Life Cycle:: Prototypes, Activities, and Outputs Matrix

See US Military MIL-STD-498 and ISO/IEC 12207 standards for further details.

For better illustration of the inter-process communications and deliveries to be produced there is a matrix of Prototypes, Activities, and Outputs shown over the diagram.

Life Cycle:: Hardware and Software Life Cycle

For the complex development, mutual Hardware and Software Life Cycle is shown on Figure 7.

Fig.7: Life Cycle:: Hardware and Software Life Cycle

System Engineering Environment include the following processes:

• Formal Reviews;
• Product Evaluation;
  
• Technical Performance Management;
• Security / Privacy Management;
  
• Interface with ISA;
  
• Risk Management;
  
• Coordination with associate and sub-contract developers;
  
• Training;
  
• Work Authorization;
  
• Verification / Qualification Planning;
  
• Project Control;
  
• Data Management;
  
• CALS;
  
• Compliance recording;
  
• Documentation Control;
  
• Corrective Actions.
  

Life Cycle:: The Role of Data Item Descriptions and Software Products

The Role of Data Item descriptions and Software Products is shown on the Figure 8.

Fig.8: Life Cycle:: The Role of Data Item Descriptions and Software Products

Project assume Data Processing Center implementation (for relatively big projects, include servers and/ or mainframes). If your Project does not assume Data Processing Center exclude CIOM, SCOM, COM, and CPM Data Items.

See US Military MIL-STD-498 standard for further details.

Downloads

	Diagrams from the above Diagram Set could be downloaded in Zip format here:
	life_cycle_dia.zip
	Diagrams are created in Dia format. For Unix/Linux users it is a standard diagram drawing software. Windows users can obtain legal GPL-ed copy of Dia from http://dia-installer.de/index_en.html

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Sergei