Large project: Takes a long time to complete; Involves a large investment;Has a big project team;Produces a large number of deliverables.
Size : Dimensions: Time;Resources (financial, number of organizations/functions);Scope (number of deliverables);Importance/Impact;Issues (number and severity);Use of new technology

Characteristics: More subprojects and team leaders; Project administration infrastructure; Formal reporting process; Greater use of formal software tools
 Tightly controlled and coordinated project plans; More formal interface meetings between groups;Full-time project managers; Multiple locations involved in the project; Multiple organizations involved in the project; More complex tasks and work to be done; More complex and difficult-to-use tools in the project; Increased integration effort between work results ofsubprojects
Challenges: Changes in the business environment: Economy; Goals and objectives; Partnerships; Dependencies; Competition;Laws, regulations, regulatory bodies( Change with time; International; Impact on communities, environment); Complexity: Technology; Schedule/Project Management
Large number of deliverables = Large number of activities; Simultaneous activities; Difficult to identify and manage project dependencies.
Financial challenges: Large investments; Long payback periods; Unbalanced budgets; Significant costs at the beginning of the project; Difficult to reliably estimate costs and benefits; Amount and timing.
Technology: Use of incompatible technology; Different standards
Scope: Continues to change; Scope creep
Time: Deliver project on time; Team fatigue
Human resources: Large teams; Multiple teams; Distributed teams; Global teams; Outsourcing.
Diverse stakeholders: Different objectives and goals; Different perceptions of risk
Keys to success: Discipline;Adaptability; Good communication;Effective