Accelerated life tests... quantifiable resultsTM

ReliaSoft's ALTA provides an intuitive and user-friendly way to utilize tremendously complex and powerful mathematical models. The software is available in two versions:

ALTA Standard provides the life-stress relationships required to analyze accelerated life test data with 1 or 2 constant stresses.

ALTA PRO offers the advanced statistical modeling power to analyze data with up to 8 simultaneous stress types and scenarios where stress is constant or varies with time.

ALTA is a part of theSynthesis Platform®.

Software Highlights - ReliaSoft's ALTA

Data Types (individually or in groups)

  • Complete
  • Right Censored
  • Left Censored
  • Interval Censored
  • Free-Form

Life-Stress Relationship Models (single or multiple stress types; stress is constant or varies with time)

  • Arrhenius
  • Eyring
  • Inverse Power Law
  • Temperature-Humidity
  • Temperature-NonThermal
  • Proportional Hazards
  • General Log-Linear (with user-defined transformations)
  • Cumulative Damage
  • Generalized Eyring

Lifetime Distributions

  • Weibull
  • Lognormal
  • Exponential

Analysis Methods

  • Maximum Likelihood (MLE)
  • Fisher Matrix Confidence Bounds

Calculated Results

  • Reliability
  • Probability of Failure
  • Mean Life
  • Reliable Life (aka Warranty Time)
  • BX% Life
  • Acceleration Factor
  • Failure Rate

Plot Types (some 2D and some 3D)

  • Probability
  • Reliability vs. Time
  • Unreliability vs. Time
  • Failure Rate vs. Time
  • pdf Plot
  • Life vs. Stress
  • Standard Deviation vs. Stress
  • Acceleration Factor vs. Stress
  • Standardized Residuals
  • Cox-Snell Residuals
  • Standardized Residuals vs. Fitted Values
  • Stress Profile (for cumulative damage)

Degradation Analysis

  • Linear
  • Exponential
  • Power
  • Logarithmic
  • Gompertz
  • Lloyd-Lipow

Accelerated Test Plans

  • 2 Level Statistically Optimum Plan
  • 3 Level Best Standard Plan
  • 3 Level Best Compromise Plan
  • 3 Level Best Equal Expected Number Failing Plan
  • 3 Level 4:2:1 Allocation Plan

Integrated Utilities

  • Distribution Wizard
  • Quick Calculation Pad
  • Likelihood Ratio Test
  • Overlay Plots (aka Multi-Plots)
  • Side-by-Side Plots
  • RS Draw® Metafile Graphics Editor
  • Monte Carlo Data
  • SimuMatic®
  • Data Set Life Comparison
  • Synthesis Workbooks (spreadsheet and word processing modules combined)
  • Function Wizard
  • Quick Parameter Estimator
  • Quick Statistical Reference

Import Types

  • Microsoft Excel® Files
  • Text Files (*.txt, *.csv, *.prn, *.smc)
  • Weibull++/ALTA 6, 7 Files

Centralized Data Storage

  • Standard Repository
  • Microsoft SQL Server®
  • Oracle®
  • Simultaneous Access by Multiple Users
  • Shared Analysis Settings and Data
  • Flexible User Access Levels


  • Integration with all other Synthesis Platform applications.

Multiple Languages Supported

Available Services

  • Detailed User Documentation
  • Practical Example Files
  • Theoretical eTextbook
  • Step-by-Step Example Guide
  • Training for Theory + Software


Real Power for Real Applications

Some of the potential applications and benefits for using quantitative accelerated life testing data analysis techniques and ReliaSoft's ALTA software include the ability to:

Why Upgrade to Version 10? (for details, visit )

For more information, quick start guide and examples, please visit