LISA uses Monte Carlo simulation of the infinite slope equation to estimate a probability of slope failure for use in relative stability assessment of natural slopes. It runs on IBM PC-compatible personal computers under MS-DOS. Graphics capability and a math coprocessor are recommended but not required. LISA will also run as a full-screen application under Micorosoft Windows.

Briefly, the user starts LISA, enters the specifications for the input parameter distributions, and then receives a histogram of the generated factors of safety for the specified conditions.

DLISA (Deterministic Level I Stability Analysis) Version 1.02

DLISA is a deterministic program which calculates the infinite slope equation for a variety of unknowns. For example, the user may choose to calculate soil depth if values for all of the other input parameters ae specified. DLISA runs on IBM PC-compatible personal computers under MS-DOS. Graphics capability and a math coprocessor are recommended but not required. DLISA will also run as a full-screen application under Microsoft Windows.

Briefly, the user starts DLISA, enters values for the known input parameters, and receives a value or list of values for the unknown parameter.

AVAILABILITY
LISA (Level I Stability Analysis) and DLISA (Deterministic Level I Stability Analysis ), the Level I slope stability computer models, are available as a free download from this page. The printed, bound manual is available free of charge by sending a request and providing a surface mail address to:

Forestry Sciences Laboratory
Rocky Mountain Research Station
1221 S. Main Street
Moscow, Idaho 83843
E-mail:

These two programs are delivered together and are described in the same manual.

The LISA software is available as a single 217,138 byte self-expanding executable DOS file. Store the file in its own directory (for example, \SS\LISA), then run LISA200 once to generate the LISA program and sample data files. From then on, run LISA or DLISA from that directory. Then email us for the manual. There is no electronic version of the LISA manual available. However, it is very important that the user read the LISA manual before relying on LISA's output.

The LISA manual explains probabilistic concepts and the mathematical basis of the model and provides suggestions for estimating input probability distributions and an example application as well as instructions for program operation.

Please read and understand the contents of the manual before you rely on any results from LISA.

A short revision history of LISA and DLISA is available, as is a short bug list.

Check our LISA FAQ (At-least-once-asked-questions) for useful hints.