How to analyze recorded videos of playtesting

The following steps were discussed and developed by Tan W.H. and Cho W.H. for analyzing Inventors of Future: 

Step 1: Walk through the game playing process yourself and determine checkpoints.
- Rule of thumb: set each change of screen as one checkpoint
- Classify playing experience according to different paths (e.g. desired path versus non-desired or unexpected path) 

Step 2: Gather time-based data for between two checkpoints for every player
- Rule of thumb: make each player as one case or unit of analysis 

Step 3: Gather other numeric data for each unit of analysis
- E.g. frequency of errors, frequency of clicking static button

Step 4: Rationalize / interpret each phenomenon of non-desired or unexpected path.
- Rule of thumb: refer to constructs of usability test

Step 5: Generate conclusive statements by cross-referencing numeric data and text-based interpretation

Step 6: Reflect the data collection and data analysis protocols to identify lessons learnt.