Hierarchical Task Analysis (HTA) is a core ergonomics approach with pedigree of over thirty years continuous use. At its heart, HTA is based upon a theory of performance and has only three governing principles. Originally developed as a means of determining training requirements, there was no way the initial pioneers of HTA could have foreseen the extent of its success. HTA has endured as a way...

the species of dioscorea (yam) are regarded as a staple food crop for millions of people in the tropical and subtropical regions of the world. it is regarded as an important food crop next to cereals and grains due to high yield storage of carbohydrates. economically, only few species are recognized for cultivation from agricultural point of view, in spite of its large species diversity. the sp...

In planning based on hierarchical task networks (HTN), plans are generated by refining high-level actions (‘compound tasks’) into lowerlevel actions, until primitive actions are obtained that can be sent to execution. While a primitive action is defined by its precondition and effects, a high-level action is defined by zero, one or several methods: sets of (high-level or primitive) actions deco...

This paper provides techniques for hierarchical task network (HTN) planning with durative actions. HTNs can provide useful heuristic guidance to planners, express goals that cannot be expressed in simple first principles planners, and allow plan generation to be limited by external constraints. The decomposition information in HTN plans can also help guide plan execution. This paper provides a ...

Work on generative planning syste[ns ha-~ focllsed On two dit,crsc aplJroac}lcs to plan construction. Ilierarchical task network (11’~N) planners build plans by successively refining high-level goals into lowerlevel activities. Operator-baqed planners employ means-end analysis to formulate plans consisting of Iow-level activities. While many have argued the universal dominance of a single appro...