6.0 Concluding remarks. At present DINDE exists as a research vehicle: for research into statistical system design and for research into questions of statistical strategy. As yet we have only produced the statistical tools necessary to perform a bivariate regression. Incorporating other and more complex statistical situations requires new and different research in applied statistics and statistical computing. Our purposes here are to outline some of the design considerations involved inpursuing such research and to encourage others to join in the endeavour. This paper has explored several techniques which place greater responsibility on the computing environment for support of an evolving data analysis. From the outset, managing the complexityof the analysis has been a primary concern for our design. In summary we think there are three aspects. The first involves the selection and application of statistical methodology, at present DINDE offers a limited choice of techniques. Yet we believe our design will scale-up gracefully as more, and more complex, techniques are installed. Next, experimentation and improvisation with new methods are simplified in the Loops environment. The user interface and all that lies behind it are expressed in a single language and exploits a common set of programming tools. Last, we offer a model (based on acyclic graphs) for the process of data analysis. We think that the subsequent discipline (attaching nodes, zooming, shrinking, partitioning the graph into sub-analyses, etc.) eases the analysts burden in organizing the analysis. Finally, it is our intention to make DINDE code available to others researchers in these areas: the code is easily extended using the tools available in LOOPS and the Interlisp-D environment. We also watch with interest the development of CommonLisp (Steele, 1984) for workstations. Some CommonLisp implementations allow incorporation of compiled Fortran algorithms, an obvious requirement for a DINDE production system. Further, we believe that much of what has been done could be ported to other object-oriented environments (e.g. Smalltalk, or CommonLoops built on CommonLisp) with minimal difficulty. (LIST ((PAGE NIL (PAPERSIZE Letter FOLIOINFO (ARABIC ) STARTINGPAGE# 27) (0 0 612 792) ((FOLIO NIL (PARALOOKS (QUAD CENTERED) CHARLOOKS (SUPERSCRIPT 0 INVISIBLE OFF SELECTPOINT OFF PROTECTED OFF SIZE 10 FAMILY CLASSIC OVERLINE OFF STRIKEOUT OFF UNDERLINE OFF EXPANSION REGULAR SLOPE REGULAR WEIGHT MEDIUM INVERTED OFF USERINFO NIL STYLE NIL) FORMATINFO (ARABIC )) (162 36 288 36) NIL) (HEADING NIL (HEADINGTYPE DINDE) (120 3600 492 36) NIL) (TEXT NIL NIL (72 72 468 648) NIL))) (PAGE NIL (PAPERSIZE Letter FOLIOINFO (ARABIC )) (0 0 612 792) ((FOLIO NIL (PARALOOKS (QUAD CENTERED) CHARLOOKS (SUPERSCRIPT 0 INVISIBLE OFF SELECTPOINT OFF PROTECTED OFF SIZE 10 FAMILY CLASSIC OVERLINE OFF STRIKEOUT OFF UNDERLINE OFF EXPANSION REGULAR SLOPE REGULAR WEIGHT MEDIUM INVERTED OFF USERINFO NIL STYLE NIL) FORMATINFO (ARABIC )) (162 36 288 36) NIL) (HEADING NIL (HEADINGTYPE DINDE) (120 3600 492 36) NIL) (TEXT NIL NIL (72 72 468 648) NIL))) (PAGE NIL (PAPERSIZE Letter FOLIOINFO (ARABIC )) (0 0 612 792) ((FOLIO NIL (PARALOOKS (QUAD CENTERED) CHARLOOKS (SUPERSCRIPT 0 INVISIBLE OFF SELECTPOINT OFF PROTECTED OFF SIZE 10 FAMILY CLASSIC OVERLINE OFF STRIKEOUT OFF UNDERLINE OFF EXPANSION REGULAR SLOPE REGULAR WEIGHT MEDIUM INVERTED OFF USERINFO NIL STYLE NIL) FORMATINFO (ARABIC )) (162 36 288 36) NIL) (HEADING NIL (HEADINGTYPE DINDE) (120 3600 492 36) NIL) (TEXT NIL NIL (72 72 468 648) NIL)))))(CLASSIC CLASSIC CLASSIC !;Êb§ zº