According to the PMBOK Guide (Project Management Body of Knowledge), specifically within the Monitor and Control Project Work process and the Project Cost and Schedule Management knowledge areas:
* Variance Analysis (Option D): This is the specific technique used to determine the cause and degree of difference between the established baseline (Scope, Schedule, or Cost) and the actual performance. By performing variance analysis, a project manager can evaluate the magnitude of a deviation and determine if corrective or preventive action is required to bring the project back in line with the plan.
Common examples include Schedule Variance (SV) and Cost Variance (CV).
* Schedule Network Analysis (Option A): This is a technique used during the Develop Schedule process to generate the project schedule model. it employs various analytical techniques, such as Critical Path Method (CPM) and Resource Leveling, to calculate the early and late start and finish dates.
* Reserve Analysis (Option B): This is used to determine the amount of contingency and management reserves needed for a project. It is performed during Estimate Costs and Determine Budget to account for uncertainty. While it is monitored during execution, its primary purpose is not the measurement of performance against a baseline.
* Alternative Analysis (Option C): This is a data analysis technique used to evaluate identified options in order to select which options or approaches to use to execute and perform the work of the project. It is often used in Plan Resource Management or Define Scope.
In the PMI framework, Variance Analysis is a critical component of Earned Value Management (EVM). It provides the necessary data for the Project Manager to report project status to stakeholders and to justify any requests for changes to the project baselines.