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Table 5 Usability issues identified in the third design iteration usability testing focus group

From: ALOHA: developing an interactive graph-based visualization for dietary supplement knowledge graph through user-centered design

Theme

Usability Issue

Heuristic

Number of participants reporting issues

(n = 8)

Lack of instruction

Lack of instructions for the node buttons

Reduce uncertainty

2/8

System complexity

Need to watch the tutorial first before using the system

Reduce uncertainty

3/8

Incomplete functionality

Search history should not contain duplicates

Group data in consistently meaningful ways

1/8

Search history should be categorized by type

Fuse data

3/8

Sometimes the lines between nodes disappear after filtering

Reduce uncertainty

1/8

The zoom button is not moving with the mouse pointer

Reduce uncertainty

1/8

The number of provided questions is not enough

Provide multiple coding of data when appropriate

1/8

The “Brief introduction” tutorial appears every time

Automate unwanted workload

1/8

Long response time

The reaction time for product search autocomplete is too long

Reduce uncertainty

2/8

Unclear information presentation

It is a little hard to understand the search results

Present new information with meaningful aids to interpretation

2/8