Creating a comprehensive outline for a performance appraisal training program that incorporates best practices, addresses cognitive bias, and draws on the principles of Radical Candor, Lenny Rachitsky's Performance Management System, and the agile methodology discussed by Peter Cappelli and Anna Tavis requires a thoughtful approach. Below is a detailed outline for such a program, including key topics and concepts:

Explanation:

Title: Enhancing Performance Appraisals: A Comprehensive Training Program

I. Introduction to Performance Appraisals

Definition and purpose of performance appraisals

Importance of effective performance appraisal systems

II$.$ Understanding Cognitive Bias

Definition of cognitive bias

Common types of bias in performance appraisals

The impact of bias on appraisal outcomes

III. Best Practices in Performance Appraisals

The importance of continuous feedback

Setting clear expectations and objectives

Evaluating both quantitative and qualitative factors

Involving employees in the appraisal process

IV$.$ Radical Candor in Performance Management

Introduction to Radical Candor by Kim Scott

Embracing honest and direct communication

Balancing care and challenge in feedback

Building trust and relationships through Radical Candor

V$.$ Lenny Rachitsky's Performance Management System

Overview of Lenny Rachitsky's approach

Aligning individual and organizational goals

Defining clear metrics and Key Performance Indicators $($KPIs$)$

Regular performance check$-$ins and updates

VI$.$ The Agile Methodology in Performance Appraisals