Web services interface policy constraints may be specified in a policy constraints language and policy processing, such as generating an intersection policy of two policies may be automated by a policy-processing engine. The method of budgeting includes allocating a budget according to one or more planning levels and selecting or defining one or more keys, each key corresponding to one or more planning levels. A foldable and portable chair has a flexible sling suspended between two scissor assemblies to define a seat and a back for the chair. Moreover, this reduction remains true in spite of variations in process, temperature and voltage. It is designed to be operated from the left side or right side of a chair, easy chair, stool, couch, or other type of seating means.