1 Introduction

2 Feature Templates  
2.1 Template I: Sharp Feature (Linear Sinusoidal Feature)  
2.2 Template II: Bump Feature  
2.3 Template III: Resonance Feature (Logarithmic Sinusoidal Feature)  

3 Cosmological Missions and Instrumental Specifications  
3.1 Cosmic Microwave Background Missions (CMB)  
3.2 Large Scale Structure Survey (LSS)  

4 Fisher Matrix Forecast Analysis

5 Results and Discussions  
5.1 Sharp Feature  
5.2 Bump Feature  
5.3 Resonance Feature  
5.4 Generic Impressions  

6 Summary and Outlook