Blackboard Systems - Stanford University

Jund 1986

Report No. STAN-CS-86- I123 A/so numbered KSL-86 I8

Blackboard Systems

bY H. Ycnny Nii

Department of Computer Science

Stanford University Stanford, CA 94305

Knowledge Systems Laboratory Report No. KSL 86-18

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June, 1986

Blackboard Systems

bY H. Penny Nii

KNOWLEDGE SYSTEMS LABORATORY Departments of Medical and Computer Science

Stanford University Stanford, California 94305 Appears in AI Magazine, Volumes 7-2 and 7-3. This report was funded by DARPA on contract N0039-83-C-0/36, N/H contract 5P4 I -PR-00785, and Boeing Computer Services contract

W266875.

Blackboard Systems

Nii

Table of Contents

1. Blackboard Model of Problem Solving 1.1. The Blackboard Model

1 3

1.2. The Blackboard Framework 1.3. Perspectives 1.4. Summary 2. Evolution of Blackboard Architectures 2.1. Prehistory 2.2. The HEARSAY Project 2.3. The HASP Project

3. Blackboard Application Systems 3.1. HEARSAY -II 3.2. HASPISIAP 3.3. CRYSALIS 3.4. TRICERO 3.5. Other Blackboard Systems 3.5.1. OPM 3.5.2. Scene Understanding

3.6. Summary 4. Blackboard Systems from a Knowledge Engineering Perspective

4.1. The Blackboard Model as a Problem-Formulation Tool 4.2. The Blackboard Model as a System Development Toot 4.3. The Blackboard Model as a Research Tool

10 15 16 17 17

20 23

31 32 40

51

58 63

64 68 71 73

75 77

79

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