As per Quantitative Morningstar Recommendation from CommSec:...

As per Quantitative Morningstar Recommendation from CommSec:
fair value for BIG is A$1.70 per share, and
it is currently "overvalued" at A$1.80 at close of business on 21/07/2017.
Personally I feel it is worth more in the longer term but please DYOR.

To view this go to CommSec, click black bar menu "Quotes & Research" and key in "BIG"
At middle of the page click "Go to full recommendation" in the PINK Box headed
"Morningstar Quantitative Recommendation".
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For those without access to CommSec an extract of part of the page is produced below:
Big Un Ltd(ASX: BIG)
Share: Information Technology / Software & Services
BuySell
Last Price
$1.800
Today's Change
0.225 (14.29%)
As of 21 Jul 2017, 4:10pm AEST. (Data sourced from ASX TradeMatch only.)

	Column 1	Column 2
0	Bid / Size	1.790 / 10,000​
1	Offer / Size	1.800 / 5,305​
2	Volume	825,491​
3	52 Week High	1.850​
4	52 Week Low	0.090​
5	Last Traded	21/07/2017 16:10:04 PM​

	Column 1	Column 2
0	Open ($)	1.575​
1	High ($)	1.800​
2	Low ($)	1.575​
3	Previously Closed ($)	1.575​

• Morningstar^™Quantitative

Current Quantitative Morningstar™ Recommendation
Morningstar™ Quantitative RecommendationQ
Overvalued on 22/07/2017
Previously Fairly Valued on 22/07/2017

Key Quantitative Values
21/07/2017
Quantitative Morningstar™ Rating
Fair Value Estimate
$ 1.7AUD
Liquidity
High
Quantitative Morningstar™ Comparison
21/07/2017

		Country​	Sector​	Industry​
1	Uncertainty	Very High	Very High	Very High
2	Economic Moat	--	--	--
3	Financial Health	Moderate	Moderate	Moderate
4	Momentum	--	--	--