# js-pert ## Program evaluation and review technique Given a set of activities with pessimistic, optimistic, probable times and the set of dependencies, will provide: - `expected time` for every activity - `variance` for every activity - the description of the activity on node `[AON]` network diagram with `predecessors` and `successors` - earliest start `[ES]` times for every node - earliest finish `[EF]` times for every node - latest start `[LS]` times for every node - latest finish `[LF]` times for every node - `slack` for every node - `critical path` description With the pert description will also provide a function to calculate the probability to complete the project in `x` days. ## Install ```bash npm install js-pert --save ``` ## Example Please look at [this example](./examples/src/index.ts). ## Documentation ### jsPERT The default exported function allow you to retrieve the description of the PERT network. Given `activities`: ```bash { [key: string]: { id: string; optimisticTime: number; mostLikelyTime: number; pessimisticTime: number; predecessors: string[]; }; } ``` You can use jsPERT as follow: ```bash import jsPERT from 'js-pert'; const pert = jsPERT(activities); console.log('PERT', pert); ``` Should log the PERT description in following shape: ```bash { activitiesParams: { [key: string]: { expectedTime: number; variance: number; }; }; network: { [key: string]: { successors: string[]; predecessors: string[]; }; }; earliestFinishTimes: { [key: string]: number; }; latestStartTimes: { [key: string]: number; }; earliestStartTimes: { [key: string]: number; }; latestFinishTimes: { [key: string]: number; }; slack: { [key: string]: number; }; criticalPath: string[]; } ``` ### pertProbability You can get the probability of completing the project in less than `x` days submitting the `PERT description` and `x` in the `pertProbability` ancillary function. ```bash import { pertProbability } from 'js-pert'; const Pz = pertProbability(pert, 22); console.log('P(x<22):', Pz); ``` ## License See the [LICENSE](LICENSE.md) file for license rights and limitations (MIT).