definitions at dashdot are:
projects have definitive starts, pass through a number of stages
and come to an end. They consume resources of people, equipment,
materials and money. The management of projects concentrates on
delivering products or outputs or deliverables.
programmes are usually a collection of separate but interdependent
projects to achieve the overall targets. The management of programmes
frequently concentrates on the interfaces between the separate
projects and focuses on the benefits to be achieved overall.
portfolios are usually collections of projects which are not directly
related or dependent on each other except for common aspects such
as funding, or types of work, or shared resources. The management
of portfolios concentrates on overall efficiency, effectiveness
multiple projects are a reflection of modern living including
multitasking with limited resources. Individuals and groups undertaking
multiple projects need to allocate their attentions and efforts
to suit changing circumstances, combinations, pressures and priorities
across the day, the week, the month, the year.