Lapidus,Martin (1990): Models. (Lascaux Graphics 7601 N. Calle
 Sin Envidia #31 Tuscon, AZ 85718)
  [CALCULUS, DIFFERENCE EQUATIONS, DIFFERENTIAL EQUATIONS,
  ECOLOGY, MODELING, MULTIPLE POPULATIONS, POPULATION,
  SINGLE POPULATION, DOS, MAC]
 <A very nice software for solving difference and differential
equations.  I found it to be very fast. In fact, I have tried a
difference equation that was implemented first on Mathematica (not
in the most efficient way), and Models was much faster and easy to
implement.  We got to see the two and three dimensional graphics
easily and nicely, and we had the option to zoom in and out on any
part of the graph.  I liked the ability of being able to rotate the
axes and the fact that it is able to solve a large system of
equations unlike Populus which could handle a maximum of four
equations.  This software also allows you to set the step size for
integrating the ODE, which is something that comes in handy when
you know some information about the ODE you are modeling.  One
disadvantage is that if you have a large system of ODEs that can be
defined iteratively using a DO LOOP then it would be tedious to use
models because you must enter each equation separately.  In my
opinion, this was one of the best software programs I played with
(for DE's).  I highly recommend this for junior or senior level
students, graduate students, and professionals.  (REVIEW 1: RATING
= 9) 

 The program is a very good tool to help students visualize
difference and differential equations.  The software overall was
simple to use and would require very little knowledge of computers. 
The only problem I had with the package is that it was difficult to
use without a mouse.  When used on a computer in which I could use
the keyboard only, I found it difficult to figure out how to do
different things.  However, when the mouse was available, the
program was easy to use, and I enjoyed using it.  In my opinion,
Models is a very easy to use software which would certainly be
useful to students in at any level who are dealing with difference
and differential equations.  (REVIEW 2: RATING = 9)>

From:
                   LISTING OF SOFTWARE (7/93)
       QUANTITATIVE CURRICULUM FOR LIFE SCIENCE STUDENTS
                    (Supported by NSF Grant)


REVIEWER 1 - Azmy Ackleh  
REVIEWER 2 - Shannon Peak 
REVIEWER 3 - Holly Gaff

For more information contact:
Dr. Louis J. Gross
Mathematics Department 
University of Tennessee
Knoxville, TN 37996-1300
(615) 974-4295    (615) 974-6576 (FAX)
gross@utkvx.utk.edu