Project closure requirements include
Project Audits
Evaluations
Deliverables status
Acceptance status
Closing of contracts
Resources reassignment details
Transfer of Knowledge to operation team
The processes require (as for all processes) the inputs, the tools and techniques, and the outputs, and these depends on the nature and type of the project, as project is unique.
The process guidelines are addressed in PMBOK Guide and may be adopted and customized as per need. The excerpts from the book are given below:
Inputs
Project Charter
Project management Plan (all Knowledge Area Plans such as Cost, Time, Quality. Communication. Risk, Procurement and others)
Project Documents
Assumption Log
Basis of Estimates
Change Log
Issue Log
Lessons Learnt
Miles Stone List
Project Communication
Quality Control Measurements
Quality Report
Requirements Documentation
Risk Register
Risk Report
Accepted Deliverables
Business Documents
Business Case
Benefit Management Plan
Agreements
Procurement Documents
Organization Process Assets
Tools and techniques
Expert Judgement
Data Analysis
Document Analysis
Regression Analysis
Trend Analysis
Variance Analysis
Meetings
Outputs
Project Document Updates
Lessons Learned Register
Final Project (Product, Service. Results, Transition Knowledge)
Final Reports
Organization Processes Assets Report
During the process of project execution, the project documents are maintained and updated as the ongoing works or activities are completed. This is necessary as later it may not be possible to recoup the data and information (the project team may not have a home during completion stage of the project). At the time of closure, the contents of these documents are finalized.
The lesson learnt during the project execution are also finalized and it becomes an important document of project closure process. The lesson learned contents may include scope management, change controls, issues and their resolutions, risks and other knowledge area controls specifying the important steps taken which were not envisaged during the planning stage.
TRANSITION
A project after the closure, is transferred to operations and maintenance team of the customer or organization itself. An overlap in the project and operation team on timeline is desirable, as it facilitates the smooth transition by better understanding the project deliverables and operation requirement.
FINAL REPORT
It describes the business case outcomes, the charter envisaged status, with variations for scope management, cost, time, resources, quality objectives and other Knowledge Area important variations, issues and resolution along with status of Health, Safety, Security, Environment and Corporate Social Responsibility.